TIMOB-14567 changed default color to black and add null value checking in propertyChanged method
TIMOB-11665 Warn only if file may be HTML.
TIMOB-14567 revert default color
Merge pull request #4498 from bijupmb/TIMOB-14567-ColorToNullOnLabelChangeToTransparent

TIMOB-14567 changed default color to black and add null value checking in propertyChanged method
Merge pull request #4517 from BlainHamon/timob-11665

TIMOB-11665 Warn only if file may be HTML.