[TYPO3-dam] clean up of media types

[René Fritz]

> I am quit impressed with how the tools section looks and functions now. One
> thing I do not understand is the cleanup of mediatypes (This function
> cleans up the media types browse tree and remove non existing types) just
> empties the whole tree. 

That is not intended, of course.
I'll check that.

> There is no way to get the media types back. I 
> emptied all tables and indexed again. That was the only way to get the
> media types back.

That's true. There's no option to rebuilt the tree. It shouldn't be needed 
when the mentioned function works correctly.

René

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