[Kget] Refactor transferhandler & transfergrouphandler?

[Carsten Pfeiffer]

Am Sonntag, 10. August 2008 schrieb Lukas Appelhans:

> dynamic_cast never returns 0 but probably an invalid pointer...

Actually it does return 0, that's the point of it. You dynamically test a 
pointer for a given type. If it's not of that type, you get 0.

Cheers,
Carsten
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