fix(developer): handle missing files in kmc-kmn #12595
Merged
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If a file is not found, the loadfile callback now returns an empty array rather than null, which kmcmplib interprets as a missing file. This means a zero-byte file will have the same outcome but as it is also generally invalid, I think that is acceptable.
The 17.0 compiler has a different callback mechanism, so won't cherry-pick to 17.0.
Fixes: #12546
Fixes: KEYMAN-DEVELOPER-292
@keymanapp-test-bot skip