Added safeguards during NotificationChannel creation.

We were getting an IllegalArgumentException during channel creation on
some Samsung phones. Stack trace didn't give me much more than that, so
just adding in some additional safeguards that make sense based on
reading AOSP.

res/values/strings.xml

@@ -674,6 +674,7 @@
     <string name="NotificationChannel_app_updates">App updates</string>
     <string name="NotificationChannel_other">Other</string>
     <string name="NotificationChannel_group_messages">Messages</string>
+    <string name="NotificationChannel_missing_display_name">Unknown</string>
 
     <!-- QuickResponseService -->
     <string name="QuickResponseService_quick_response_unavailable_when_Signal_is_locked">Quick response unavailable when Signal is locked!</string>

src/org/thoughtcrime/securesms/database/helpers/SQLCipherOpenHelper.java

@@ -247,6 +247,7 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
 
       if (oldVersion < NOTIFICATION_CHANNELS) {
         db.execSQL("ALTER TABLE recipient_preferences ADD COLUMN notification_channel TEXT DEFAULT NULL");
+        NotificationChannels.create(context);
 
         try (Cursor cursor = db.rawQuery("SELECT recipient_ids, system_display_name, signal_profile_name, notification, vibrate FROM recipient_preferences WHERE notification NOT NULL OR vibrate != 0", null)) {
           while (cursor != null && cursor.moveToNext()) {
@@ -257,7 +258,7 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
             String  messageSound    = cursor.getString(cursor.getColumnIndexOrThrow("notification"));
             Uri     messageSoundUri = messageSound != null ? Uri.parse(messageSound) : null;
             int     vibrateState    = cursor.getInt(cursor.getColumnIndexOrThrow("vibrate"));
-            String  displayName     = NotificationChannels.getChannelDisplayNameFor(systemName, profileName, address);
+            String  displayName     = NotificationChannels.getChannelDisplayNameFor(context, systemName, profileName, address);
             boolean vibrateEnabled  = vibrateState == 0 ? TextSecurePreferences.isNotificationVibrateEnabled(context) : vibrateState == 1;
 
             String channelId = NotificationChannels.createChannelFor(context, address, displayName, messageSoundUri, vibrateEnabled);

src/org/thoughtcrime/securesms/notifications/NotificationChannels.java

@@ -86,8 +86,16 @@ public class NotificationChannels {
     return Build.VERSION.SDK_INT >= 26;
   }
 
-  public static String getChannelDisplayNameFor(@Nullable String systemName, @Nullable String profileName, @NonNull Address address) {
+  public static @NonNull String getChannelDisplayNameFor(@NonNull Context context, @Nullable String systemName, @Nullable String profileName, @NonNull Address address) {
-    return TextUtils.isEmpty(systemName) ? (TextUtils.isEmpty(profileName) ? address.serialize() : profileName) : systemName;
+    if (!TextUtils.isEmpty(systemName)) {
+      return systemName;
+    } else if (!TextUtils.isEmpty(profileName)) {
+      return profileName;
+    } else if (!TextUtils.isEmpty(address.serialize())) {
+      return address.serialize();
+    } else {
+      return context.getString(R.string.NotificationChannel_missing_display_name);
+    }
   }
 
   /**
@@ -97,7 +105,7 @@ public class NotificationChannels {
   public static String createChannelFor(@NonNull Context context, @NonNull Recipient recipient) {
     VibrateState vibrateState     = recipient.getMessageVibrate();
     boolean      vibrationEnabled = vibrateState == VibrateState.DEFAULT ? TextSecurePreferences.isNotificationVibrateEnabled(context) : vibrateState == VibrateState.ENABLED;
-    String       displayName      = getChannelDisplayNameFor(recipient.getName(), recipient.getProfileName(), recipient.getAddress());
+    String       displayName      = getChannelDisplayNameFor(context, recipient.getName(), recipient.getProfileName(), recipient.getAddress());
 
     return createChannelFor(context, recipient.getAddress(), displayName, recipient.getMessageRingtone(context), vibrationEnabled);
   }
@@ -121,9 +129,12 @@ public class NotificationChannels {
     setLedPreference(channel, TextSecurePreferences.getNotificationLedColor(context));
     channel.setGroup(CATEGORY_MESSAGES);
     channel.enableVibration(vibrationEnabled);
+
+    if (messageSound != null) {
       channel.setSound(messageSound, new AudioAttributes.Builder().setContentType(AudioAttributes.CONTENT_TYPE_UNKNOWN)
                                                                   .setUsage(AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_INSTANT)
                                                                   .build());
+    }
 
     NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
     if (notificationManager == null) {
@@ -213,7 +224,7 @@ public class NotificationChannels {
     }
 
     NotificationChannel channel = new NotificationChannel(recipient.getNotificationChannel(context),
-                                                          getChannelDisplayNameFor(recipient.getName(), recipient.getProfileName(), recipient.getAddress()),
+                                                          getChannelDisplayNameFor(context, recipient.getName(), recipient.getProfileName(), recipient.getAddress()),
                                                           NotificationManager.IMPORTANCE_HIGH);
     channel.setGroup(CATEGORY_MESSAGES);
     notificationManager.createNotificationChannel(channel);