Updating zero capacity resource semantics (#4555)

python/ray/worker.py

@@ -653,6 +653,13 @@ class Worker(object):
                     raise ValueError(
                         "Resource quantities must all be whole numbers.")
 
+            # Remove any resources with zero quantity requirements
+            resources = {
+                resource_label: resource_quantity
+                for resource_label, resource_quantity in resources.items()
+                if resource_quantity > 0
+            }
+
             if placement_resources is None:
                 placement_resources = {}
 
@@ -1870,7 +1877,7 @@ def connect(node,
             nil_actor_counter,  # actor_counter.
             [],  # new_actor_handles.
             [],  # execution_dependencies.
-            {"CPU": 0},  # resource_map.
+            {},  # resource_map.
             {},  # placement_resource_map.
         )