From 51a84aaa57b59c3068df395ce036cafa7b8dc414 Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Fri, 5 May 2006 21:45:26 -0400
Subject: ENH: handle empty variables

---
 Source/cmCommandArgumentParserHelper.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Source/cmCommandArgumentParserHelper.cxx b/Source/cmCommandArgumentParserHelper.cxx
index f24cab6..570cc2d 100644
--- a/Source/cmCommandArgumentParserHelper.cxx
+++ b/Source/cmCommandArgumentParserHelper.cxx
@@ -91,6 +91,10 @@ char* cmCommandArgumentParserHelper::ExpandSpecialVariable(const char* key, cons
 
 char* cmCommandArgumentParserHelper::ExpandVariable(const char* var)
 {
+  if(!var)
+    {
+    return 0;
+    }
   if(this->FileName && strcmp(var, "CMAKE_CURRENT_LIST_FILE") == 0)
     {
     return this->AddString(this->FileName);
-- 
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