<rdar://problem/13455021>

Another fix to make sure that if we aren't able to extract an object file for any reason, we don't crash when trying to parse the debug map info.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@182441 91177308-0d34-0410-b5e6-96231b3b80d8