From 12493779b9da29d96c949f092d0923cb25a7971f Mon Sep 17 00:00:00 2001
From: Jeremy Ashkenas <jashkenas@gmail.com>
Date: Wed, 11 Aug 2010 00:02:49 -0400
Subject: [PATCH] fixing Issue #545 ... whitespace-only heredocs.

---
 lib/lexer.js     | 2 +-
 src/lexer.coffee | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/lexer.js b/lib/lexer.js
index 8cf3c9bf..c23e2d33 100644
--- a/lib/lexer.js
+++ b/lib/lexer.js
@@ -143,7 +143,7 @@
         return false;
       }
       quote = match[1].substr(0, 1);
-      doc = this.sanitizeHeredoc(match[2] || match[4], {
+      doc = this.sanitizeHeredoc(match[2] || match[4] || '', {
         quote: quote
       });
       this.interpolateString(quote + doc + quote, {
diff --git a/src/lexer.coffee b/src/lexer.coffee
index 364592f8..3a70fd72 100644
--- a/src/lexer.coffee
+++ b/src/lexer.coffee
@@ -130,7 +130,7 @@ exports.Lexer = class Lexer
   heredocToken: ->
     return false unless match = @chunk.match(HEREDOC)
     quote = match[1].substr 0, 1
-    doc = @sanitizeHeredoc match[2] or match[4], {quote}
+    doc = @sanitizeHeredoc match[2] or match[4] or '', {quote}
     @interpolateString quote + doc + quote, heredoc: yes
     @line += count match[1], "\n"
     @i += match[1].length