Protect possible NPE in MediaOutputDialogReceiver

-Do nothing if package name is empty

Bug: 181654879
Test: manual test
Change-Id: I4c36a811d71e28e800d0b8398c998da3263218d8

packages/SystemUI/src/com/android/systemui/media/dialog/MediaOutputDialogReceiver.kt

@@ -20,9 +20,13 @@ import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
 import android.text.TextUtils
+import android.util.Log
 import com.android.settingslib.media.MediaOutputConstants
 import javax.inject.Inject
 
+private const val TAG = "MediaOutputDlgReceiver"
+private val DEBUG = Log.isLoggable(TAG, Log.DEBUG)
+
 /**
  * BroadcastReceiver for handling media output intent
  */
@@ -32,8 +36,13 @@ class MediaOutputDialogReceiver @Inject constructor(
     override fun onReceive(context: Context, intent: Intent) {
         if (TextUtils.equals(MediaOutputConstants.ACTION_LAUNCH_MEDIA_OUTPUT_DIALOG,
                         intent.action)) {
-            mediaOutputDialogFactory.create(
-                    intent.getStringExtra(MediaOutputConstants.EXTRA_PACKAGE_NAME), false)
+            val packageName: String? =
+                    intent.getStringExtra(MediaOutputConstants.EXTRA_PACKAGE_NAME)
+            if (!TextUtils.isEmpty(packageName)) {
+                mediaOutputDialogFactory.create(packageName!!, false)
+            } else if (DEBUG) {
+                Log.e(TAG, "Unable to launch media output dialog. Package name is empty.")
+            }
         }
     }
 }