Reducers keep status=GET when there is an error

[diegocasmo]

Action creators don't tell reducers to change their status to NONE when there is an error during fetch/get. In addition to adding the error to the errors reducer (as it is done now), the catch part of each action creator should somehow signal to change the reducer status attribute to NONE as well.

The effects of this misbehavior can be seen when trying to see/update a workout/exercise that doesn't exist: http://localhost:3000/workouts/123, http://localhost:3000/workouts/update/123.