[BUGFIX] Avoid wrong SQL query in fe_login user group redirect

[BUGFIX] Avoid wrong SQL query in fe_login user group redirect

Ensure that no invalid group data is collected and check
if any group is set at all before running the SQL query.

Change-Id: I5792ff606d60ba5e5a108ed18c2ec91e354f85ff
Resolves: #64966
Releases: master, 6.2
Reviewed-on: https://review.typo3.org/39447
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Markus Klein <markus.klein@typo3.org>