fix empty string checks in umfmessage.js#217

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JustusFluegel wants to merge 3 commits intopnxtech:masterfrom

JustusFluegel:fix-umf-validity-check

Commits on Nov 22, 2020

fix validate function
Justus Fluegel
committed
Fix all string checks
Justus Fluegel
committed

Commits on Nov 23, 2020

Remove use of nullish-coalescing-operator, change strings to singlequote
Justus Fluegel
committed