From d16d3a010c5386775f189b0309268ba1e45810fb Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 16 Sep 2016 12:23:43 +0100
Subject: Ignore blank lines in style map

---
 NEWS                         | 4 ++++
 lib/options-reader.js        | 6 +++---
 test/options-reader.tests.js | 7 +++++++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/NEWS b/NEWS
index 9f06d54..eedb309 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+# 1.2.2
+
+* Ignore blank lines in style map.
+
 # 1.2.1
 
 * Use alt text title as alt text for images when the alt text description is
diff --git a/lib/options-reader.js b/lib/options-reader.js
index 3765fd3..dc17fe8 100644
--- a/lib/options-reader.js
+++ b/lib/options-reader.js
@@ -75,11 +75,11 @@ function readCustomStyleMap(styleMap) {
         return [];
     } else if (_.isString(styleMap)) {
         return styleMap.split("\n")
-            .filter(function(line) {
-                return line.charAt(0) !== "#";
-            })
             .map(function(line) {
                 return line.trim();
+            })
+            .filter(function(line) {
+                return line !== "" && line.charAt(0) !== "#";
             });
     } else {
         return styleMap;
diff --git a/test/options-reader.tests.js b/test/options-reader.tests.js
index 06e0764..b0f202b 100644
--- a/test/options-reader.tests.js
+++ b/test/options-reader.tests.js
@@ -38,6 +38,13 @@ test('lines starting with # in custom style map are ignored', function() {
     assert.deepEqual(standardOptions.styleMap, options.styleMap.slice(1));
 });
 
+test('blank lines in custom style map are ignored', function() {
+    var options = readOptions({
+        styleMap: "\n\n"
+    });
+    assert.deepEqual(standardOptions.styleMap, options.styleMap);
+});
+
 test('default style mappings are ignored if includeDefaultStyleMap is false', function() {
     var options = readOptions({
         styleMap: "p.SectionTitle => h2",
-- 
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