Fix crash in getMetricsTag

SettingsIntelligence put a null in intent extra bundle, caused the
crash. Check the null before use it.

Fixes: 137351833
Test: make RunSettingsRoboTests
Change-Id: I9630760396c72bddf6a11314b869873c3b83b45a

src/com/android/settings/SettingsActivity.java

@@ -205,10 +205,14 @@ public class SettingsActivity extends SettingsBaseActivity
     }
 
     private String getMetricsTag() {
-        String tag = getClass().getName();
+        String tag = null;
         if (getIntent() != null && getIntent().hasExtra(EXTRA_SHOW_FRAGMENT)) {
             tag = getIntent().getStringExtra(EXTRA_SHOW_FRAGMENT);
         }
+        if (TextUtils.isEmpty(tag)) {
+            Log.w(LOG_TAG, "MetricsTag is invalid " + tag);
+            tag = getClass().getName();
+        }
         if (tag.startsWith("com.android.settings.")) {
             tag = tag.replace("com.android.settings.", "");
         }