IDispatch Proxy/Stub Fixes

[Robert Shearman]

Changelog:
- Don't print out cryptic message if IDispatch or IUnknown object is 
just NULL.
- puArgErr is a ref pointer so we have to provide a dummy pointer if it 
is NULL.
- Fail gracefully and notify caller if we ran out of memoy or if variant 
copying failed.

-- 
Rob Shearman

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