[TYPO3-core] RFC: Fix bug #6210: UserTSConfig value "options.moduleMenuCollapsable=0" does not work

[Christian Kuhn]

This is an SVN patch request.

Type: Bugfix

Problem:
According to doc_core_tsconfig at
http://typo3.org/documentation/document-library/references/doc_core_tsconfig/4.1.0/view/1/2/
the Main Module Menu (left frame) should be not collapsible if
UserTSconfig options.moduleMenuCollapsable = 0 is set. Default is 1.
This does not work because of a unsufficient distinction of 0 and unset.

Solution:
Distinguish between 0 and unset in the logic.

Bugtracker references:
http://bugs.typo3.org/view.php?id=6210

Branches:
TYPO3_4-1 & Trunk

Christian
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