Renamed RelationshipAdd event to RelationshipAdded and made null check create none relationship if an existing relationship didn't exist

src/Discord.Net.WebSocket/DiscordSocketClient.Events.cs

@@ -217,7 +217,7 @@ namespace Discord.WebSocket
         private readonly AsyncEvent<Func<SocketGroupUser, Task>> _recipientRemovedEvent = new AsyncEvent<Func<SocketGroupUser, Task>>();
         
         // relationships
-        public event Func<SocketRelationship, SocketRelationship, Task> RelationshipAdd
+        public event Func<SocketRelationship, SocketRelationship, Task> RelationshipAdded
         {
             add { _relationshipAddedEvent.Add(value); }
             remove { _relationshipAddedEvent.Remove(value); }

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -1509,7 +1509,7 @@ namespace Discord.WebSocket
                                     await _gatewayLogger.DebugAsync("Received Dispatch (RELATIONSHIP_ADD)").ConfigureAwait(false);
 
                                     var addedModel = (payload as JToken).ToObject<Relationship>(_serializer);
-                                    var before = State.GetRelationship(addedModel.Id);
+                                    var before = State.GetRelationship(addedModel.Id) ?? SocketRelationship.Create(this, State, new Relationship { Id = addedModel.Id, Type = RelationshipType.None, User = addedModel.User });
                                     var after = AddRelationship(addedModel, State);
 
                                     await _relationshipAddedEvent.InvokeAsync(before, after);

src/Discord.Net.WebSocket/Entities/Users/SocketRelationship.cs

@@ -1,7 +1,9 @@
-using Model = Discord.API.Relationship;
+using System.Diagnostics;
+using Model = Discord.API.Relationship;
 
 namespace Discord.WebSocket
 {
+    [DebuggerDisplay("{Type} - {User}")]
     public class SocketRelationship : IRelationship
     {
         public RelationshipType Type { get; internal set; }