🔪 Remove print statement from PreventUpdate handler.

Author: T4rk1n

Diff for: dash/dash.py

@@ -159,10 +159,9 @@ def __init__(
             Compress(self.server)
 
         @self.server.errorhandler(exceptions.PreventUpdate)
-        def _handle_error(error):
+        def _handle_error(_):
             """Handle a halted callback and return an empty 204 response"""
-            print(error, file=sys.stderr)
-            return ('', 204)
+            return '', 204
 
         # static files from the packages
         self.css = Css()