Prevent undefined action crash

[alvaropaco]

I've done a little modification to prevent a undefined Exception. When you dont have signed action var in the middleware, the app crashes.

[timdorr]

The action always needs to exist. If you don't pass one into dispatch, that's not using Redux correctly. Thanks, but this is handled upstream.

[alvaropaco]

May you considerate this. The crash occurs with redux-logger middleware.