[BUGFIX] Show removal link in clipboard only if elements are available

The removal link in the clipboard is always shown, no matter if
elements are stored in the clipboard or not.

Resolves: #63016
Releases: master
Change-Id: I55c207be3a9acfd0c2a68c29299655a46b83df77
Reviewed-on: http://review.typo3.org/34253
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>