#3 CHierarchy.findType causes memory access violation

[Ernest Foster]

When CHierarchy.findType(const std::string &aType) is
called with a string which does not correspond to any
of the valid types the following error is generated:

unknown location(0): fatal error in
"testHierarchyUtilities": signal: memory access violation

I'm not sure what the designed behavior should be here,
but I would guess that the returned iterator should
refer to a NULL VertexDescriptor.

I've uploaded an addition to the unit test for GraphRep
that illustrates the problem. (in the branches directory)

[Ernest Foster]

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Revision 35 of the branches work area should contain a fix
for this bug. I've run the new unit test against it and it
passes.