Add error message for provider is not None assertion

underyx · underyx · commit cd67ffe239be · 2016-07-18T18:28:03.000+02:00
diff --git a/flask_redis.py b/flask_redis.py
@@ -20,7 +20,7 @@ def __init__(self, app=None, strict=False, config_prefix='REDIS'):
 
     @classmethod
     def from_custom_provider(cls, provider, app=None, **kwargs):
-        assert provider is not None
+        assert provider is not None, 'your custom provider cannot be None, come on'
 
         # We never pass the app parameter here, so we can call init_app
         # ourselves later, after the provider class has been set
