check contents length for empty file

index.js

@@ -25,6 +25,9 @@ var gulpSass = function gulpSass(options, sync) {
     if (file.isStream()) {
       return cb(new gutil.PluginError(PLUGIN_NAME, 'Streaming not supported'));
     }
+    if (!file.contents.length) {
+      return cb(null, file);
+    }
     if (path.basename(file.path).indexOf('_') === 0) {
       return cb();
     }

test/main.js

@@ -414,4 +414,11 @@ describe('gulp-sass -- sync compile', function() {
       }))
       .on('end', done);
   });
+
+  it('should work with empty files', function(done) {
+    gulp.src(path.join(__dirname, '/scss/empty.scss'))
+      .pipe(sass.sync())
+      .pipe(gulp.dest(path.join(__dirname, '/results/')))
+      .on('end', done);
+  });
 });