[BUGFIX] RTE is not loading in IE8, when used with feedit

Solution: Avoid calls to undefined console methods

Change-Id: I1c2b72113a6a0045996ca5a219cd0bd49f6a0ae8
Fixes: #40558
Releases: 6.0, 4.7, 4.6
Reviewed-on: http://review.typo3.org/14311
Reviewed-by: Stanislas Rolland
Tested-by: Stanislas Rolland