From 0d3bbe81231e8c6ba66bb9000181f751fe14b9f0 Mon Sep 17 00:00:00 2001
From: Ken Martin <ken.martin@kitware.com>
Date: Mon, 3 May 2004 15:33:42 -0400
Subject: [PATCH] minor backwards fix

---
 Source/cmIfCommand.cxx | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Source/cmIfCommand.cxx b/Source/cmIfCommand.cxx
index c094cdd7d..5c6c632d4 100644
--- a/Source/cmIfCommand.cxx
+++ b/Source/cmIfCommand.cxx
@@ -153,6 +153,13 @@ bool cmIfCommand::IsTrue(const std::vector<std::string> &args,
   const char *def;
   const char *def2;
 
+  // handle empty invocation
+  if (args.size() < 1)
+    {
+    isValid = true;
+    return false;
+    }
+  
   // store the reduced args in this vector
   std::deque<std::string> newArgs;
   int reducible = 1;