rpcrt4: Don't crash in NdrDllGetClassObject when a NULL pclsid is passed in.

[Rob Shearman]

Add tests for this.
---
 dlls/rpcrt4/cpsf.c        |    2 +-
 dlls/rpcrt4/tests/cstub.c |   13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletions(-)
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