Merge pull request #520 from minrk/fix-default-config

fix setting default parent

Author: minrk

ipyparallel/cluster/cluster.py

@@ -264,6 +264,12 @@ def _default_log(self):
     _controller = Any()
     _engine_sets = Dict()
 
+    def __init__(self, **kwargs):
+        """Construct a Cluster"""
+        if 'parent' not in kwargs and 'config' not in kwargs:
+            kwargs['parent'] = self._default_parent()
+        super().__init__(**kwargs)
+
     def __del__(self):
         if not self.shutdown_atexit:
             return