feat(package): Add support for missing version

lib/package.js

@@ -52,6 +52,10 @@ exports.calculateNewVersion = function (options) {
   options = options || {};
   return exports.getUserPackage()
   .then(function (userPackage) {
+    if (!userPackage.version) {
+      return null;
+    }
+
     var split = userPackage.version.split('.');
 
     if (options.major) {

lib/writer.js

@@ -42,7 +42,11 @@ exports.markdown = function (version, commits, options) {
     heading = '####';
   }
 
-  heading += ' ' + version + ' (' + date + ')';
+  if (version) {
+    heading += ' ' + version + ' (' + date + ')';
+  } else {
+    heading += ' ' + date;
+  }
 
   content.push(heading);
   content.push('');

test/package.test.js

@@ -147,6 +147,16 @@ describe('package', function () {
         Expect(version).to.eql('1.2.3');
       });
     });
+
+    it('returns null if no version is specified', function () {
+      Package.getUserPackage.restore();
+      Sinon.stub(Package, 'getUserPackage').returns(Bluebird.resolve({ version: '' }));
+
+      return Package.calculateNewVersion()
+      .then(function (version) {
+        Expect(version).to.eql(null);
+      });
+    });
   });
 
 });

test/writer.test.js

@@ -43,6 +43,17 @@ describe('writer', function () {
       });
     });
 
+    it('keeps only the date if no version is specified', function () {
+      var options = { major: true };
+
+      return Writer.markdown(false, [], options)
+      .then(function (changelog) {
+        var heading = changelog.split('\n')[0];
+
+        Expect(heading).to.equal('## ' + new Date().toJSON().slice(0,10));
+      });
+    });
+
     it('flushes out a commit type with its full name', function () {
       var commits = [
         { type: 'feat', category: 'testing', subject: 'did some testing', hash: '1234567890' }