fix right click service on custom nodes with empty services, load services to custom node when drawn on canvas, show current services for custom node's service dialog

daemon/core/gui/nodeutils.py

@@ -106,6 +106,17 @@ class NodeUtils:
                 logging.error("invalid icon: %s", core_node.icon)
         return image
 
+    @classmethod
+    def is_custom(cls, model):
+        return model not in cls.NODE_MODELS
+
+    @classmethod
+    def get_custom_node_services(cls, gui_config, name):
+        for m in gui_config["nodes"]:
+            if m["name"] == name:
+                return m["services"]
+        return []
+
     @classmethod
     def setup(cls):
         nodes = [