quartz: Do not assert() the existence of a media format of an input pin

[Paul Chitescu]

Changelog:
	quartz: Do not assert() the existence of a media format of an input pin.

According to MS documentation and tests (will be submitted later since without 
this patch wine aborts) an ISampleGrabber may have no pbFormat or some fields 
may be zero to indicate no preference.

http://msdn.microsoft.com/en-us/library/dd376993(VS.85).aspx

Should fix current regression described in bug #20210

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