updates to allow setting 0 services for a node, but old gui does not send data in a way that can be compatible

daemon/core/emulator/emudata.py

@@ -74,7 +74,7 @@ class NodeOptions:
         self.canvas = None
         self.icon = None
         self.opaque = None
-        self.services = []
+        self.services = None
         self.config_services = []
         self.x = None
         self.y = None

daemon/core/services/coreservices.py

@@ -404,12 +404,11 @@ class CoreServices:
         :param services: names of services to add to node
         :return: nothing
         """
-        if not services:
+        if services is None:
             logging.info(
                 "using default services for node(%s) type(%s)", node.name, node_type
             )
             services = self.default_services.get(node_type, [])
-
         logging.info("setting services for node(%s): %s", node.name, services)
         for service_name in services:
             service = self.get_service(node.id, service_name, default_service=True)