rpcrt4: Allow NULL networkaddr and endpoint in rpcrt4_np_get_top_of_tower.

[Robert Shearman]

Add tests for this.
---
  dlls/rpcrt4/rpc_transport.c |   14 ++++++++++----
  dlls/rpcrt4/tests/rpc.c     |   10 ++++++++++
  2 files changed, 20 insertions(+), 4 deletions(-)
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