Return nil here instead of empty string.

diff --git a/ElvUI_SLE/modules/chat/chat.lua b/ElvUI_SLE/modules/chat/chat.lua
index e2d01f8..fef5f0e 100644
--- a/ElvUI_SLE/modules/chat/chat.lua
+++ b/ElvUI_SLE/modules/chat/chat.lua
@@ -86,8 +86,8 @@ local function GetChatIcon(sender)
 		return specialChatIcons[senderRealm][senderName]
 	end

-	if not T.IsInGuild() then return "" end
-	if not C.db.guildmaster then return "" end
+	if not T.IsInGuild() then return nil end
+	if not C.db.guildmaster then return nil end
 	if senderName == C.GMName and senderRealm == C.GMRealm then
 		return leader
 	end