allow for optional to be null for back compatibility

Author: runestonetest

controllers/books.py

@@ -177,7 +177,7 @@ def dummy():
             (db.questions.subchapter == subchapter)
             & (db.questions.chapter == chapter)
             & (db.questions.from_source == True)  # noqa: E712
-            & (db.questions.optional == False)
+            & ((db.questions.optional == False) | (db.questions.optional == None))
             & (db.questions.base_course == base_course)
         ).select(db.questions.name)
         div_counts = {q.name: 0 for q in page_divids}
@@ -186,7 +186,7 @@ def dummy():
             & (db.questions.chapter == chapter)
             & (db.questions.base_course == base_course)
             & (db.questions.from_source == True)  # noqa: E712
-            & (db.questions.optional == False)
+            & ((db.questions.optional == False) | (db.questions.optional == None))
             & (db.questions.name == db.useinfo.div_id)
             & (db.useinfo.course_id == auth.user.course_name)
             & (db.useinfo.sid == auth.user.username)