evaluate multi streams

Author: Leandro Inocencio

NodeGraphQt/base/node.py

@@ -795,7 +795,7 @@ def update_streams(self, *args):
             for port, nodeList in node.connected_output_nodes().items():
                 nodes.extend(nodeList)
 
-            if not nodes:
+            if not node.connected_output_nodes():
                 try:
                     node.run()
                 except Exception as error: