Update Instrumentation.newActivity to pass non-null application.

Activity.attach expects a non-null application, so pass an empty
applicaiton if Instrumentation.newActivity is called with a null obj.

Change-Id: If4a131ef46f101b8b4a726886fe76412c45c30ec
Fixes: 73294588
Test: atest tests/app/src/android/app/cts/TabActivityTest.java
1 file changed