added check for empty env var

Author: neilpeterson

azure-vote/azure-vote/main.py

@@ -10,17 +10,17 @@
 # Load configurations from environment or config file
 app.config.from_pyfile('config_file.cfg')
 
-if "VOTE1VALUE" in os.environ:
+if ("VOTE1VALUE" in os.environ and os.environ['VOTE1VALUE']):
     button1 = os.environ['VOTE1VALUE']
 else:
     button1 = app.config['VOTE1VALUE']
 
-if "VOTE2VALUE" in os.environ:
+if ("VOTE2VALUE" in os.environ and os.environ['VOTE2VALUE']):
     button2 = os.environ['VOTE2VALUE']
 else:
     button2 = app.config['VOTE2VALUE']
 
-if "TITLE" in os.environ:
+if ("TITLE" in os.environ and os.environ['TITLE']):
     title = os.environ['TITLE']
 else:
     title = app.config['TITLE']