fix a bug that a server with empty remark prevents oksaving.

Author: Cenmrev

V2RayX/ServerProfile.m

@@ -34,7 +34,7 @@ - (NSDictionary*)dictionaryForm {
              @"port": [NSNumber numberWithInteger:port],
              @"userId": userId,
              @"alterId": [NSNumber numberWithInteger:alterId],
-             @"remark": remark,
+             @"remark": remark != nil ? remark : @"",
              @"allowPassive": allowPassive,
              @"useMkcp": useMkcp};
 }