backport of cloudpipe/cloudpickle#140, Fix #129: do not silence RuntimeError in dump()

Author: BryanCutler

python/pyspark/cloudpickle.py

@@ -262,6 +262,8 @@ def dump(self, obj):
             if 'recursion' in e.args[0]:
                 msg = """Could not pickle object as excessively deep recursion required."""
                 raise pickle.PicklingError(msg)
+            else:
+                raise
 
     def save_memoryview(self, obj):
         self.save(obj.tobytes())