[TYPO3-core] RFC: #12299: EM tries to read from tables of not installed extensions

[Steffen Kamper]

Hi,

This is SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=12299

Branches: trunk

If you click on an extension that isn't installed and go to the 
backup/delete view, EM tries to read the table data, which leads to SQL 
errors.

Solution:
don't do this if extension isn't installed

vg Steffen
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