Exception Throwing in Redis Connection Problem

[tarikalim]

When I used Redis as a backend, I encountered a problem: whenever the Redis connection was broken and I called a function using decorators ( it is happening when I use cached_stampede since redlock doesn't raise redis connection errors), the decorator would throw an exception, preventing the function from executing. Perhaps an additional option could be to have the function wrapped by the decorator run directly in case of a connection error.

If I understand problem correctly I can try to implement this feature.

[Dreamsorcerer]

Seems plausible once #625 is done.