Accept RESULT_UNKNOWN as a code from gdb as well as "done" or "error".
Accept RESULT_UNKNOWN as a code from gdb as well as "done" or "error".

This doesn't happen with gdb but does happen quite often with idb so handle
it properly.  I should probably catch this and assume RESULT_UNKNOWN is an
error, after all if the command had worked then idb would know that it had
done.

ashleypittman/padb,ashleypittman/padb,ashleypittman/padb