gulp task error handling

gulpfile.js

gulp.task('sass', function () {
  return gulp.src('./scss/ionic.app.scss')
    .pipe(sass().on('error', onErrorResumeNext))  // the meat
    .pipe(gulp.dest('./www/css/'))
})

function onErrorResumeNext (err) {
  gutil.log(err)    // logs the error for dianostics
  this.emit('end')  // ends the stream
}