Fix in CVS HEAD for contactgroup expansion

[Ton Voon]

Hi!

I've just committed a fix for a problem that hit me. If a contactgroup  
is set but cannot be expanded, nagios silently drops the expansion and  
all the other contact groups as well. The output from the validation  
says "Error: Could not find any contactgroup matching ...", but it  
comes back with Errors: 0 in the validation process.

The change now errors when an unknown contact group is specified.  
There's a test case for this and all the existing test cases pass as  
well, but I'd appreciate information if this works for you.

Ton


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