Fix icon support for secondary users.

This fixes the problem when switching to a secondary user and
icons are currently applied.  Prior to this patch the secondary
user would see droids as their icons and apps would FC at start.

Change-Id: Icd4275eae5868612bf2a81b375ac4d0779a61395
Don't create idmap if app doesn't have resources.arsc

Some apps do not have a restable but some legacy themes
try to theme these apps anyways. In this case we skip
the idmap creation process.

Change-Id: I8bc60984299791733d4fe8c9bbcaa75eca6d736b