[TYPO3-core] FYI #16602: CleanUp: tcaTree has redundant code passages

[Steffen Ritter]

Hey list,
FYI: attached patch has been committed to svn trunk in rev. 9672

Type: Cleanup

Bugtracker references:
http://bugs.typo3.org/view.php?id=16602

Branches:
trunk

Problem:
as mentioned by Oliver Klee in a Discussion about 16508 there is some 
code-Redundancy in the tcaTree-Dataprovider. --> Clean this up a little bit.

Furthermore I streamlined some Variable usage and superfluous if conditions

regards
Steffen
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