Don't put up loading UI if load isn't necessary.

Do not put up the loading UI when we don't need to load (whether that's
because we're already up to date or there is already a load in progress)

Bug: 114136250
Test: Manual; go to recents and see that it doesn't load when updated
Change-Id: Idbcc3731e4ecab8f67b7b5b07a98cb112ed4e07a