Handle empty apn string in setInitialAttachApn HIDL API.

Do not convert empty str to null in ril_service.cpp hidl conversion
as apn cannot be passed as null. QC expects empty apn string.

Change-Id: If9810f2d7741491e4ed440d20c95230e09a4b5d3
Fix: 62066962
Test: manual
1 file changed
tree: b7aee2bdc4bfddd3961b982d3ccfb4b9afdb71a0
  1. include/
  2. libril/
  3. librilutils/
  4. reference-ril/
  5. rild/
  6. CleanSpec.mk