Fixes #7279: Fix exception when tracing cable with no associated path

netbox/dcim/views.py

@@ -2411,6 +2411,12 @@ class PathTraceView(generic.ObjectView):
             else:
                 path = related_paths.first()
 
+        # No paths found
+        if path is None:
+            return {
+                'path': None
+            }
+
         # Get the total length of the cable and whether the length is definitive (fully defined)
         total_length, is_definitive = path.get_total_length() if path else (None, False)