Update sqlalchemy 1.4 working

cps/db.py

@@ -619,9 +619,10 @@ class CalibreDB():
             randm = false()
         off = int(int(pagesize) * (page - 1))
         query = self.session.query(database) \
-            .join(*join, isouter=True) \
             .filter(db_filter) \
             .filter(self.common_filters(allow_show_archived))
+        if len(join):
+            query = query.join(*join, isouter=True)
         entries = list()
         pagination = list()
         try:

requirements.txt

@@ -9,7 +9,7 @@ iso-639>=0.4.5,<0.5.0
 PyPDF3>=1.0.0,<1.0.4
 pytz>=2016.10
 requests>=2.11.1,<2.25.0
-SQLAlchemy>=1.3.0,<1.4.0
+SQLAlchemy>=1.3.0,<1.5.0
 tornado>=4.1,<6.2
 Wand>=0.4.4,<0.7.0
 unidecode>=0.04.19,<1.2.0