CameraITS: fix divide by 0 bug

Bug: 28718586
Change-Id: I68145098e8cdf4819c9b88bdb280cc429672fc4c
diff --git a/apps/CameraITS/tests/scene2/test_faces.py b/apps/CameraITS/tests/scene2/test_faces.py
index c05fbc7..ba4f317 100644
--- a/apps/CameraITS/tests/scene2/test_faces.py
+++ b/apps/CameraITS/tests/scene2/test_faces.py
@@ -34,7 +34,10 @@
         gain, exp, _, _, focus = cam.do_3a(get_results=True)
         print 'iso = %d' % gain
         print 'exp = %.2fms' % (exp*1.0E-6)
-        print 'fd = %.2fcm' % (1.0E2/focus)
+        if focus == 0.0:
+            print 'fd = infinity'
+        else:
+            print 'fd = %.2fcm' % (1.0E2/focus)
         for fd_mode in fd_modes:
             assert(FD_MODE_OFF <= fd_mode <= FD_MODE_FULL)
             req = its.objects.auto_capture_request()