Don't crash in background after app uninstall.

It's possible for an app to be uninstalled during a
LOAD_SIZES phase of the ApplicationsState measurement. By
catching the IllegalStateException which is thrown, we can
continue without crashing.

Change-Id: I9aae8928dc7205c52f61d09345d5226e7bd07f49
Fixes: 36845611
Test: Manual