minor fix

Author: jchanvfx

NodeGraphQt/base/graph.py

@@ -1017,6 +1017,7 @@ def center_on(self, nodes=None):
         Args:
             nodes (list[NodeGraphQt.BaseNode]): a list of nodes.
         """
+        nodes = nodes or []
         self._viewer.center_selection([n.view for n in nodes])
 
     def center_selection(self):

NodeGraphQt/widgets/viewer.py

@@ -1189,6 +1189,9 @@ def center_selection(self, nodes=None):
                 nodes = self.selected_nodes()
             elif self.all_nodes():
                 nodes = self.all_nodes()
+            if not nodes:
+                return
+
         if len(nodes) == 1:
             self.centerOn(nodes[0])
         else: