Fix 'pid' and 'executable' fields in the list-thread-group.
Fix 'pid' and 'executable' fields in the list-thread-group.

The documentation says that these fields should be generated when 
we have proper process or target file. Current implementation did not
check for this. Eclipse seem to use list-thread-group command even
before setting the executable in which case current implementation
can return garbage data.



git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@215658 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb