Use fallback method if the importer throws

This prevent users from seeing empty data usage if
the importer throws.

Test: Manual
Bug: 233825704
Change-Id: Iab27e8eb6f2ed406f932507100aaf74abb997c83
Merged-In: Iab27e8eb6f2ed406f932507100aaf74abb997c83
  (pure cherry-picked from ag/18581710)
1 file changed