Hide files list header, when theres no files to see
Create FileList.updateEmptyContent() and fix not showing emptycontent after deletion
Improve updateEmptyContent logic
Fix shared folder still showing fileheader
Fix mind-boggling emptycontent logic
Fixed empty content logic

- Remove obsolete code that used another approach for hiding emptycontent
- Fixed logic for the showing of the empty content message
Merge pull request #5310 from owncloud/hide_filestable-header_when_empty

Hide files list header, when theres no files to see