fixbug get_choices_content

Author: rockstarr-programmerr

classroom/models/abstracts/question.py

@@ -60,6 +60,8 @@ def get_answers_content(self):
         return answers
 
     def get_choices_content(self):
+        if not self.choices:
+            return []
         return self.choices.split(self._DELEMITER)
 
     @classmethod