Fix a bug whereby a score entered of all 0's would not be scored
Fix a bug whereby a score entered of all 0's would not be scored

As stuff was only stored when a change was made a  score of all 0's would
not be stored. Now skipping the storing stage is only permitted when the
key already exists.

shaywood/srobo-compdis,shaywood/srobo-compdis,shaywood/srobo-compdis