fix: when using browserify dont create source code caching

.editorconfig

@@ -0,0 +1,14 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# 2 space indentation
+[**.*]
+indent_style = space
+indent_size = 2

lib/reporter.js

@@ -127,9 +127,10 @@ var CoverageReporter = function(rootConfig, helper, logger) {
 
  helper.mkdirIfNotExists(outputDir, function() {
  log.debug('Writing coverage to %s', outputDir);
+ var _ = helper._;
  var options = helper.merge({}, reporterConfig, {
  dir : outputDir,
- sourceStore : new SourceCacheStore({
+ sourceStore : _.isEmpty(sourceCache) ? null : new SourceCacheStore({
  sourceCache: sourceCache
  })
  });

test/reporter.spec.coffee

@@ -34,6 +34,7 @@ describe 'reporter', ->
  mockReportCreate = sinon.stub().returns writeReport: mockWriteReport
  mockMkdir = sinon.spy()
  mockHelper =
+ _: helper._
  isDefined: (v) -> helper.isDefined v
  merge: (v...) -> helper.merge v...
  mkdirIfNotExists: mockMkdir