Make sure we can do a get on the base class.

or this will loop forever and sometime (like keypairs) there is classes
that don't have a get method.

novaclient/base.py

@@ -223,6 +223,8 @@ class Resource(object):
         return "<%s %s>" % (self.__class__.__name__, info)
 
     def get(self):
+        if not hasattr(self.manager, 'get'):
+            return
         new = self.manager.get(self.id)
         if new:
             self._add_details(new._info)