Fix newly discovered crashes in FusedLocationProvider

We recently discovered the FusedLocationProvider doesn't function well
when the gps or network provider is missing, but these errors were
previously hidden. Now that the crashes are apparent, deal with cases
where these providers may not be present.

Bug: 214358333
Test: presubmits
Change-Id: I660592bee4897fc335f5fe1d2f2499c047b62e66