fix(writer): don't print category if empty

lib/git.js

@@ -47,7 +47,7 @@ exports.getCommits = function () {
     }
 
     commit.type = parsed[1].toLowerCase();
-    commit.category = parsed[3];
+    commit.category = parsed[3] || '';
     commit.subject = parsed[4];
 
     return commit;

lib/writer.js

@@ -67,9 +67,9 @@ exports.markdown = function (version, commits, options) {
     Object.keys(this.types[type]).forEach(function (category) {
       var prefix = '*';
       var nested = types[type][category].length > 1;
-      var categoryHeading = '* **' + category + ':**';
+      var categoryHeading = prefix + (category ? ' **' + category + ':**' : '');
 
-      if (nested) {
+      if (nested && category) {
         content.push(categoryHeading);
         prefix = '  *';
       } else {

test/writer.test.js

@@ -122,7 +122,7 @@ describe('writer', function () {
       });
     });
 
-    it('breaks a commit category onto its own line if there are more than one commit in it', function () {
+    it('breaks a commit category onto its own line if there is more than one commit in it', function () {
       var category = 'testing';
       var commits = [
         { type: 'feat', category: category, subject: 'did some testing', hash: '1234567890' },
@@ -144,6 +144,26 @@ describe('writer', function () {
       });
     });
 
+    it('omits commit category if there was no category defined', function () {
+      var hash = '1234567890';
+      var commits = [
+        { type: 'feat', category: 'testing', subject: 'did some testing', hash: hash },
+        { type: 'test', category: '', subject: 'other changes', hash: hash }
+      ];
+
+      return Writer.markdown(VERSION, commits, {})
+      .then(function (changelog) {
+        return changelog.split('\n');
+      })
+      .filter(function (line) {
+        return line.indexOf(hash.slice(0, 8)) > -1;
+      })
+      .then(function (lines) {
+        Expect(lines[0]).to.equal('* **testing:** did some testing (12345678)');
+        Expect(lines[1]).to.equal('* other changes (12345678)');
+      });
+    });
+
     it('trims the commit hash to only 8 chars', function () {
       var category = 'testing';
       var hash = '1234567890';