[BUGFIX] TYPO3 prompts to select position when there are no pages

When adding the very first page to the page tree, TYPO3 asks to
select a position and offers a weird looking selector (see the
attachment in the bug report). Instead, it should proceed
straight to the page properties window (or redirect to it).

Change-Id: Ia55a1c1959d70c5f755281a4c6a6f77aa179ed5f
Resolves: #32111
Releases: 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/7075
Reviewed-by: Stefan Neufeind
Reviewed-by: Tolleiv Nietsch
Tested-by: Tolleiv Nietsch
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter