iOS fix: contact event

Author: huangminlinux

src/ios/Plugins/JMessageHelper.m

@@ -139,7 +139,7 @@ - (void)onReceiveFriendNotificationEvent:(JMSGFriendNotificationEvent *)event {
             [[NSNotificationCenter defaultCenter] postNotificationName:kJJMessageContactNotify
                                                                 object:@{
                                                                          @"type":@"invite_received",
-                                                                         @"reason":[friendEvent eventDescription],
+                                                                         @"reason":[friendEvent eventDescription] ?: @"",
                                                                          @"fromUsername":[friendEvent getFromUser].username,
                                                                          @"fromUserAppKey":user.appKey}];
         }
@@ -150,7 +150,7 @@ - (void)onReceiveFriendNotificationEvent:(JMSGFriendNotificationEvent *)event {
             [[NSNotificationCenter defaultCenter] postNotificationName:kJJMessageContactNotify
                                                                 object:@{
                                                                          @"type":@"invite_accepted",
-                                                                         @"reason":[friendEvent eventDescription],
+                                                                         @"reason":[friendEvent eventDescription] ?: @"",
                                                                          @"fromUsername":[friendEvent getFromUser].username,
                                                                          @"fromUserAppKey":user.appKey}];
         }
@@ -161,7 +161,7 @@ - (void)onReceiveFriendNotificationEvent:(JMSGFriendNotificationEvent *)event {
             [[NSNotificationCenter defaultCenter] postNotificationName:kJJMessageContactNotify
                                                                 object:@{
                                                                          @"type":@"invite_declined",
-                                                                         @"reason":[friendEvent eventDescription],
+                                                                         @"reason":[friendEvent eventDescription] ?: @"",
                                                                          @"fromUsername":[friendEvent getFromUser].username,
                                                                          @"fromUserAppKey":user.appKey}];
         }
@@ -172,7 +172,7 @@ - (void)onReceiveFriendNotificationEvent:(JMSGFriendNotificationEvent *)event {
             [[NSNotificationCenter defaultCenter] postNotificationName:kJJMessageContactNotify
                                                                 object:@{
                                                                          @"type":@"contact_deleted",
-                                                                         @"reason":[friendEvent eventDescription],
+                                                                         @"reason":[friendEvent eventDescription] ?: @"",
                                                                          @"fromUsername":[friendEvent getFromUser].username,
                                                                          @"fromUserAppKey":user.appKey}];
         }