Bug 859440 - Allow for ListView without adapter in robocop; r=jmaher

mobile/android/base/tests/BaseTest.java.in

@@ -19,6 +19,7 @@ import android.os.SystemClock;
 import android.test.ActivityInstrumentationTestCase2;
 import android.util.DisplayMetrics;
 import android.view.View;
+import android.widget.ListAdapter;
 import android.widget.ListView;
 import java.io.File;
 import java.io.InputStream;
@@ -427,7 +428,12 @@ abstract class BaseTest extends ActivityInstrumentationTestCase2<Activity> {
                 for (ListView view : views) {
                     if (view.getTag().equals(tagName)) {
                         tabView = view;
-                        childCount = view.getAdapter().getCount();
+                        ListAdapter adapter = view.getAdapter();
+                        if (adapter != null) {
+                            childCount = adapter.getCount();
+                        } else {
+                            childCount = 0;
+                        }
                         if (expectedChildCount < 0 || expectedChildCount == childCount) {
                             return view;
                         }