Suppress onIsMenuChanged runtime error messages
PageRowGlobalToolBarUI makes a connection to onIsMenuChanged in applicationWindow().globalDrawer, but somteimes it's not actually a GLobalDrawer and doesn't have the right signal. So we want to make sure we're only targeting it if it is in fact a GlobalDrawer. Otherwise it won't have the needed signal and we'll get a warning.
BUG: 471561 FIXED-IN: 6.0
Edited by Nate Graham