This fixes the double scrollbars issue
content size checks are not valid for LOCK
Return false in case one of the values is null
Merge pull request #11043 from owncloud/test-againstNull

Return false in case the passed values are not of type string
remove 'set -e' - causes issues during ci execution
Merge pull request #10974 from owncloud/fix-app-content-overflow

This fixes the double scrollbars issue
Merge pull request #11041 from owncloud/no-size-check-on-lock-master

content size checks are not valid for LOCK