Backport PR #4106: fix a couple of default block values

should be None

closes  #4103

should be backported to 1.1

IPython/parallel/client/view.py

@@ -379,7 +379,7 b' class View(HasTraits):'
     # Decorators
     #-------------------------------------------------------------------
 
-    def remote(self, block=True, **flags):
+    def remote(self, block=None, **flags):
         """Decorator for making a RemoteFunction"""
         block = self.block if block is None else block
         return remote(self, block=block, **flags)
@@ -797,7 +797,7 b' class DirectView(View):'
     def __setitem__(self,key, value):
         self.update({key:value})
 
-    def clear(self, targets=None, block=False):
+    def clear(self, targets=None, block=None):
         """Clear the remote namespaces on my engines."""
         block = block if block is not None else self.block
         targets = targets if targets is not None else self.targets