Properly tolerate missing declaring source files
Properly tolerate missing declaring source files

Broken in 228d6b8a4f0a21c1e9b2372c3104ce4ee19f65b4

Bug: 12802375
Change-Id: I60eeefeb3aff3e0a9f143791cf772e531a68d16a

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst