Better error handling.

lms/envs/aws_migrate.py

@@ -4,5 +4,9 @@ import os
 USER = os.environ.get('DB_MIGRATION_USER', 'root')
 PASSWORD = os.environ.get('DB_MIGRATION_PASS', None)
 
+if not PASSWORD:
+   raise ImproperlyConfigured("No database password was provided for running "
+                              "migrations.  This is fatal.")
+
 DATABASES['default']['USER'] = USER
 DATABASES['default']['PASSWORD'] = PASSWORD