Revert sections checks for empty array

background/style-manager.js

@@ -358,7 +358,7 @@ const styleManager = (() => {
       if (match === 'excluded') {
         excluded = true;
       }
-      for (const section of (data.sections || [])) {
+      for (const section of data.sections) {
         if (styleCodeEmpty(section.code)) {
           continue;
         }

edit/edit.js

@@ -170,6 +170,7 @@ preinit();
         $('#name').title = usercss ? t('usercssReplaceTemplateName') : '';
 
         $('#preview-label').classList.toggle('hidden', !style.id);
+
         $('#beautify').onclick = () => beautify(editor.getEditors());
         $('#lint').addEventListener('scroll', hideLintHeaderOnScroll, {passive: true});
         window.addEventListener('resize', () => debounce(rememberWindowSize, 100));
@@ -340,20 +341,19 @@ function initStyleData() {
   // TODO: remove .replace(/^\?/, '') when minimum_chrome_version >= 52 (https://crbug.com/601425)
   const params = new URLSearchParams(location.search.replace(/^\?/, ''));
   const id = Number(params.get('id'));
-  const createNewSection = () => [
+  const createEmptyStyle = () => ({
+    name: params.get('domain') ||
+          tryCatch(() => new URL(params.get('url-prefix')).hostname) ||
+          '',
+    enabled: true,
+    sections: [
       Object.assign({code: ''},
         ...Object.keys(CssToProperty)
           .map(name => ({
             [CssToProperty[name]]: params.get(name) && [params.get(name)] || []
           }))
       )
-  ];
+    ],
-  const createEmptyStyle = () => ({
-    name: params.get('domain') ||
-          tryCatch(() => new URL(params.get('url-prefix')).hostname) ||
-          '',
-    enabled: true,
-    sections: createNewSection(),
   });
   return fetchStyle()
     .then(style => {
@@ -372,12 +372,7 @@ function initStyleData() {
 
   function fetchStyle() {
     if (id) {
-      return API.getStyle(id).then(style => {
+      return API.getStyle(id);
-        if (!style.sections || !style.sections.length) {
-          style.sections = createNewSection();
-        }
-        return style;
-      });
     }
     return Promise.resolve(createEmptyStyle());
   }

edit/sections-editor.js

@@ -46,7 +46,7 @@ function createSectionsEditor({style, onTitleChanged}) {
 
   let sectionOrder = '';
   const initializing = new Promise(resolve => initSection({
-    sections: (style.sections || []).slice(),
+    sections: style.sections.slice(),
     done:() => {
       // FIXME: implement this with CSS?
       // https://github.com/openstyles/stylus/commit/2895ce11e271788df0e4f7314b3b981fde086574
@@ -436,7 +436,7 @@ function createSectionsEditor({style, onTitleChanged}) {
     function chunk() {
       if (!originalSections.length) {
         setGlobalProgress();
-        if (focusOn !== false && sections[focusOn]) {
+        if (focusOn !== false) {
           setTimeout(() => sections[focusOn].cm.focus());
         }
         container.classList.remove('hidden');
@@ -545,7 +545,7 @@ function createSectionsEditor({style, onTitleChanged}) {
     updateSectionOrder();
   }
 
-  function replaceSections(originalSections = []) {
+  function replaceSections(originalSections) {
     for (const section of sections) {
       section.remove(true);
     }

edit/source-editor.js

@@ -18,7 +18,7 @@ function createSourceEditor({style, onTitleChanged}) {
   const dirty = dirtyReporter();
 
   // normalize style
-  if (!style.id || !style.sections.length) setupNewStyle(style);
+  if (!style.id) setupNewStyle(style);
 
   const cm = cmFactory.create($('.single-editor'), {
     value: style.sourceCode,
@@ -123,7 +123,6 @@ function createSourceEditor({style, onTitleChanged}) {
   }
 
   function setupNewStyle(style) {
-    if (!style.sections) style.sections = [];
     style.sections[0].code = ' '.repeat(prefs.get('editor.tabSize')) +
       `/* ${t('usercssReplaceTemplateSectionBody')} */`;
     let section = sectionsToMozFormat(style);

edit/util.js

@@ -103,7 +103,7 @@ function sectionsToMozFormat(style) {
     domains:     'domain',
     regexps:     'regexp',
   };
-  return (style.sections || []).map(section => {
+  return style.sections.map(section => {
     let cssMds = [];
     for (const i in propertyToCss) {
       if (section[i]) {

install-usercss/install-usercss.js

@@ -365,7 +365,7 @@
 
   function getAppliesTo(style) {
     function *_gen() {
-      for (const section of (style.sections || [])) {
+      for (const section of style.sections) {
         for (const type of ['urls', 'urlPrefixes', 'domains', 'regexps']) {
           if (section[type]) {
             yield *section[type];

js/messaging.js

@@ -290,12 +290,8 @@ function ignoreChromeError() {
 
 function getStyleWithNoCode(style) {
   const stripped = deepCopy(style);
-  if (stripped.sections && stripped.sections.length) {
   for (const section of stripped.sections) section.code = null;
   stripped.sourceCode = null;
-  } else {
-    stripped.sections = []; // Fixes #687
-  }
   return stripped;
 }
 

js/usercss.js

@@ -71,7 +71,7 @@ const usercss = (() => {
         if (!sections.length || errors && !allowErrors) {
           throw errors;
         }
-        style.sections = sections || [];
+        style.sections = sections;
         return allowErrors ? {style, errors} : style;
       });
   }

manage/manage.js

@@ -230,7 +230,7 @@ function createStyleElement({style, name}) {
   // clear the code to free up some memory
   // (note, style is already a deep copy)
   style.sourceCode = null;
-  (style.sections || []).forEach(section => (section.code = null));
+  style.sections.forEach(section => (section.code = null));
 
   const entry = parts.entry.cloneNode(true);
   entry.id = ENTRY_ID_PREFIX_RAW + style.id;
@@ -266,7 +266,7 @@ function createStyleTargetsElement({entry, style}) {
   let numTargets = 0;
   const displayed = new Set();
   for (const type of TARGET_TYPES) {
-    for (const section of (style.sections || [])) {
+    for (const section of style.sections) {
       for (const targetValue of section[type] || []) {
         if (displayed.has(targetValue)) {
           continue;