Fix for Loopback Stress test nullpointer exception

Plugs a nullpointer exception that occurs if an individual test iteration times out.
Also added check to see if result data is good before printing it to CSV file

Bug: 64715529
Change-Id: I4c5aaecd32b24fca3cb684f1a2b8b1adfcdb3287
Fixes: 64715529
Test:  tradefed.sh  run google/test/framework/media/audio-loopback-stress --iterations 10 -s 84B0115625000809
1 file changed
tree: 38076df1a3824d3acbd78d496067c8a30170df1c
  1. res/
  2. src/
  3. .gitignore
  4. Android.mk
  5. MANIFEST.mf
  6. OWNERS
  7. README
  8. README.txt