[TYPO3-core] RFC: #16646: help_aboutmoules hardcoded as start up module - returns error if uninstalled

[Steffen Kamper]

Hi,

This is an SVN patch request.

Type: bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=16645

Branches:
Trunk

There are some occasions where the defined startmodule is not present:
* if startmodule is not installed
* if startmodule is not visible after switching to workspace
* if module store has no entries

In these cases a console message is send. This was not the final 
solution anyway, so fix it with this patch

in first and second situation jump to first available module instead,
with third situation display a flashmessage.

How to test:
Switch to workspace having about_modules as startmodule (default)

vg Steffen
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