From 3b2efc7b0bdabd99ea207f498b82e3b39eb7ef8d Mon Sep 17 00:00:00 2001
From: Chris Forbes <chrisf@ijw.co.nz>
Date: Sat, 24 Sep 2011 19:58:34 +1200
Subject: [PATCH] fix #1184 -- useless error message when forgetting to define
 Render:Image: on a derived actor type

---
 OpenRA.Game/Graphics/SequenceProvider.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/OpenRA.Game/Graphics/SequenceProvider.cs b/OpenRA.Game/Graphics/SequenceProvider.cs
index b8ace3a5ce..74c3a16cf3 100644
--- a/OpenRA.Game/Graphics/SequenceProvider.cs
+++ b/OpenRA.Game/Graphics/SequenceProvider.cs
@@ -59,6 +59,10 @@ namespace OpenRA.Graphics
 
 		public static bool HasSequence(string unit, string seq)
 		{
+			if (!units.ContainsKey(unit))
+				throw new InvalidOperationException(
+					"Unit `{0}` does not have any sequences defined.".F(unit));
+
 			return units[unit].ContainsKey(seq);
 		}
 	}