Fixed bug where My Results page would break when a round with empty gues...

...ses was present.

Added #round_verify method to Round class that checks to see if the last round created has zero guesses.
If so, it destroys the record.

Changed a few redirects to remove redundancy:
"/deck/round/#{round.id}/deck/#{@deck_name}" to
"/round/#{round.id}/deck/#{@deck_name}"