Fix rating diff being undefined when solving unrated puzzles #14403
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Fixes #14393
The issuse was created #14277 which itself was introduced by 4a54a23. More specifically a76f4c3 and 0649bc5.
It was caused by changing to
looseHwhich cannot handle a number, and which tried to re-unify 0 and null as the same value, which is not possible in this case. I rolled back to the old version.I chose to use the original
hfunction, so had to revert thelooseHalias. It's more code but felt cleaner than aliasing h.Tested for: