Hide AppWedge name if resource not found

[fennifith]

I never thought this would be an issue when writing it, but apparently I need to add some behavior for what to do if an app using Attribouter does not have a label. Granted, it is entirely possible to only put labels on the launcher activity, and the end user will likely not notice a thing, but this is still a bad practice. Maybe it would find use in packages that exist only as helper components (an external plugin for another app, for example).

Regardless, this shouldn't cause a crash, and Attribouter should just hide the label in this case. See AppWedge:100.