Annotation Tools: Thumbnail check breaks on creation

 - Fixed second similar function.

Conflicts:
	common/static/js/vendor/ova/OpenSeaDragonAnnotation.js
Merge pull request #5395 from lduarte1991/lduarte-harvardx-pr30

Annotation Tools: Fixes issue - Thumbnail check breaks tool on creation
Merge pull request #5397 from edx/hotfix-annotations

Hotfix annotations
Merge remote-tracking branch 'origin/release' into merge-conflicts-release

Conflicts:
	common/static/js/vendor/ova/OpenSeaDragonAnnotation.js
Merge pull request #5400 from edx/merge-conflicts-release

Merge conflicts release