From f6a15893e49ff4557187d8a1ddf59768e777deae Mon Sep 17 00:00:00 2001
From: Robin Ward <robin.ward@gmail.com>
Date: Mon, 28 Jul 2014 16:50:16 -0400
Subject: [PATCH] Small updates from upstream markdown-js

---
 vendor/assets/javascripts/better_markdown.js | 22 +++++++++++++-------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/vendor/assets/javascripts/better_markdown.js b/vendor/assets/javascripts/better_markdown.js
index 017cb414d..78a6db20f 100644
--- a/vendor/assets/javascripts/better_markdown.js
+++ b/vendor/assets/javascripts/better_markdown.js
@@ -473,8 +473,12 @@
       delete attributes.src;
     }
 
-    for ( var a in attributes )
-      tag_attrs += " " + a + '="' + escapeHTML( attributes[ a ] ) + '"';
+    for ( var a in attributes ) {
+      var escaped = escapeHTML( attributes[ a ]);
+      if (escaped && escaped.length) {
+        tag_attrs += " " + a + '="' + escaped + '"';
+      }
+    }
 
     // be careful about adding whitespace here for inline elements
     if ( tag === "img" || tag === "br" || tag === "hr" )
@@ -577,7 +581,7 @@
       jsonml[ 0 ] = "img";
 
       // grab this ref and clean up the attribute node
-      ref = references[ attrs.ref ];
+      var ref = references[ attrs.ref ];
 
       // if the reference exists, make the link
       if ( ref ) {
@@ -745,7 +749,8 @@
         block_search:
         do {
           // Now pull out the rest of the lines
-          var b = this.loop_re_over_block(re, block.valueOf(), function(m) { ret.push( m[1] ); });
+          var b = this.loop_re_over_block(
+                    re, block.valueOf(), function( m ) { ret.push( m[1] ); } );
 
           if ( b.length ) {
             // Case alluded to in first comment. push it back on as a new block
@@ -1008,11 +1013,11 @@
             } // tight_search
 
             if ( li_accumulate.length ) {
+
               var contents = this.processBlock(li_accumulate, []),
                   firstBlock = contents[0];
 
               if (firstBlock) {
-
                 firstBlock.shift();
                 contents.splice.apply(contents, [0, 1].concat(firstBlock));
                 add( last_li, loose, contents, nl );
@@ -1042,11 +1047,11 @@
 
             var next_block = next[0] && next[0].valueOf() || "";
 
-            if ( next_block.match(is_list_re) ) {
+            if ( next_block.match(is_list_re) )  {
               block = next.shift();
 
               // Check for an HR following a list: features/lists/hr_abutting
-              var hr = this.dialect.block.horizRule.apply(this, [block, next]);
+              var hr = this.dialect.block.horizRule.call( this, block, next );
 
               if ( hr ) {
                 ret.push.apply(ret, hr);
@@ -1113,6 +1118,7 @@
 
         // Strip off the leading "> " and re-process as a block.
         var input = block.replace( /^> ?/gm, "" ),
+            old_tree = this.tree,
             processedBlock = this.toTree( input, [ "blockquote" ] ),
             attr = extract_attr( processedBlock );
 
@@ -1213,7 +1219,7 @@
         return out;
       },
 
-      // These characters are intersting elsewhere, so have rules for them so that
+      // These characters are interesting elsewhere, so have rules for them so that
       // chunks of plain text blocks don't include them
       "]": function () {},
       "}": function () {},