Updated Contest status accessor

The Contest.results attribute is initialized as a blank string. The check performed by Contest.is_contest_complete does not correctly handle this case.

Author: mmcinnestaylor

src/contestadmin/models.py

@@ -78,4 +78,4 @@ def is_contest_complete(self):
         Returns true if contest is complete, false otherwise
         """
 
-        return self.results is not None
+        return self.results != "" and self.results is not None