Catch one more MPI beta test failure.

Author: sserita

test/test_packages/extras/test_interpygate.py

@@ -12,7 +12,7 @@
     _comm = MPI.COMM_WORLD
     _rank = _comm.Get_rank()
     _size = _comm.Get_size()
-except ImportError:
+except (ImportError, RuntimeError):
     _comm = None
     _rank = 0
     _size = 1