Minor cleanup

src/Discord.Net/Models/Server.cs

@@ -186,8 +186,10 @@ namespace Discord
 
         public Task Ban(User user, int pruneDays = 0)
         {
-            var request = new AddGuildBanRequest(user.Server.Id, user.Id);
-            request.PruneDays = pruneDays;
+            var request = new AddGuildBanRequest(user.Server.Id, user.Id)
+            {
+                PruneDays = pruneDays
+            };
             return Client.ClientAPI.Send(request);
         }
         public Task Unban(User user, int pruneDays = 0)

src/Discord.Net/Net/Rest/SharpRestEngine.cs

@@ -45,7 +45,8 @@ namespace Discord.Net.Rest
 		public Task<string> Send(string method, string path, string json, CancellationToken cancelToken)
 		{
 			var request = new RestRequest(path, GetMethod(method));
-			request.AddParameter("application/json", json, ParameterType.RequestBody);
+            if (json != null)
+			    request.AddParameter("application/json", json, ParameterType.RequestBody);
 			return Send(request, cancelToken);
 		}
 		public Task<string> SendFile(string method, string path, string filename, Stream stream, CancellationToken cancelToken)