From 63234735d880e699104272a00d5767f743fb6e65 Mon Sep 17 00:00:00 2001
From: Jim Derry <balthisar@gmail.com>
Date: Thu, 26 Nov 2015 11:21:48 +0800
Subject: [PATCH] Allows null value css-prefix to be used in a config file
 without issuing a warning.

---
 src/config.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/config.c b/src/config.c
index 2ce42cb..d1a61c5 100644
--- a/src/config.c
+++ b/src/config.c
@@ -1206,7 +1206,10 @@ Bool ParseCSS1Selector( TidyDocImpl* doc, const TidyOptionImpl* option )
     }
     buf[i] = '\0';
 
-    if ( i == 0 || !TY_(IsCSS1Selector)(buf) ) {
+    if ( i == 0 ) {
+        return no;
+    }
+    else if ( !TY_(IsCSS1Selector)(buf) ) {
         TY_(ReportBadArgument)( doc, option->name );
         return no;
     }