Alex Lin e58ba61d8e MTV/variable server crashes if checkpoint has less malfunctions then currently running sim
Did two things to stop the crash.  1.  When following an address path if we hit a NULL
address, stop processing and return the NULL.  2.  When trying to resolve addresses in
copy_sim_data, if a NULL address is returned then reset the reference to unresolved and
return a dummy value.

Need to fix MTV to handle dummy value returns.

refs #117
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