idegen fails to build a correct dependency graph if one of the submodules it identifies lacks an Android.mk file

The current failure mode is for the tool to throw an Exception and stop.
This commit makes it possible for the tool to continue in the face of such a missing .mk file.

Test: manual
Change-Id: I42991fe7cda07e0fae2eb037649d88133afde1c7
1 file changed