Make `Answer.__init__()` by returning immediately upon empty name

mentoring/answer.py

@@ -59,10 +59,10 @@ class AnswerBlock(XBlock):
         Use lazy property instead of XBlock field, as __init__() doesn't support 
         overwriting field values
         """
-        student_input = ''
-
         # Only attempt to locate a model object for this block when the answer has a name
-        if self.name:
+        if not self.name:
+            return ''
+
         student_input = self.get_model_object().student_input
 
         # Default value can be set from another answer's current value