fix: handle empty metaculus prediction

src/backend/platforms/metaculus/api.ts

@@ -49,7 +49,8 @@ const predictableProps = {
   community_prediction: {
     properties: {
       full: {
-        properties: {
+        // q1/q2/q3 can be missing, e.g. https://www.metaculus.com/api2/questions/1633/
+        optionalProperties: {
           q1: {
             type: "float64",
           },

src/backend/platforms/metaculus/index.ts

@@ -38,7 +38,8 @@ async function apiQuestionToFetchedQuestions(
     const isBinary = q.possibilities.type === "binary";
     let options: FetchedQuestion["options"] = [];
     if (isBinary) {
-      const probability = Number(q.community_prediction.full.q2);
+      const probability = q.community_prediction.full.q2;
+      if (probability !== undefined) {
         options = [
           {
             name: "Yes",
@@ -52,6 +53,7 @@ async function apiQuestionToFetchedQuestions(
           },
         ];
       }
+    }
     return {
       id: `${platformName}-${q.id}`,
       options,