From 1e888cde24c42cfb86badf2216fe8579912317da Mon Sep 17 00:00:00 2001
From: FiniteReality <FiniteReality@users.noreply.github.com>
Date: Mon, 8 May 2017 22:15:47 +0100
Subject: [PATCH] Fix CheckPreconditions giving empty service provider

Parameter preconditions were always getting the empty service provider,
even when a custom one was provided in ExecuteAsync, which means that
preconditions which use services cannot work properly.
---
 src/Discord.Net.Commands/Info/ParameterInfo.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Discord.Net.Commands/Info/ParameterInfo.cs b/src/Discord.Net.Commands/Info/ParameterInfo.cs
index 9eea82cb2..2ecf26a9f 100644
--- a/src/Discord.Net.Commands/Info/ParameterInfo.cs
+++ b/src/Discord.Net.Commands/Info/ParameterInfo.cs
@@ -42,7 +42,7 @@ namespace Discord.Commands
 
         public async Task<PreconditionResult> CheckPreconditionsAsync(ICommandContext context, object arg, IServiceProvider services = null)
         {
-            services = EmptyServiceProvider.Instance;
+            services = services ?? EmptyServiceProvider.Instance;
 
             foreach (var precondition in Preconditions)
             {