[DO NOT MERGE] Add null check for map's ActivityView

sdk_gcar_x86 target doesn't have map in carlauncher
Thus add null check

Bug: 157520581
Test: boot sdk_gcar_x86, carlauncher shouldn't crash
Change-Id: I842a9249c9e036ecc185055436df4b4f2dc15284
1 file changed
tree: f532817b5caa480a9c3b6fedfe74044cf1e1ee05
  1. res/
  2. src/
  3. Android.mk
  4. AndroidManifest.xml