I recently hit a case where an extension that adds a bunch of actions

was hitting errors during devserver initialization and reloads. The

issue seems to be that it was never fully initialized, then the

devserver reloaded, and hitting an error during the extension shutdown

was leaving old action registrations around, which would then fail due

to duplicates. This seems like it's probably a devserver-specific

problem, but it's annoying. This change catches any ItemLookupErrors

that get triggered during ActionHook shutdown.

Was able to use my extension.