[BUGFIX] check presence of sprite folder before starting sprity

app/templates/gulp/css.js

@@ -47,17 +47,20 @@ gulp.task('css', ['sprites', 'svg'], function() {
 
 // create spritesheet
 gulp.task('sprites', function() {
-	return sprity.src({
-			src: settings.path().sprites + '/**/*.png',
-			name: 'sprites',
-			style: '_sprite.scss',
-			cssPath: path.relative(path.resolve(settings.path().css), path.resolve(settings.path().images)) + '/',
-			template: 'gulp/sprite-scss-template.mustache',
-			orientation: 'binary-tree',
-			cachebuster: true
-		})
-		.pipe(imagemin())
-		.pipe(gulpif('*.png', gulp.dest(settings.path().images), gulp.dest(settings.path().sass)));
+	// necessary right now because of https://github.com/sprity/sprity/issues/23
+	if (fs.existsSync(settings.path().sprites)) {
+		return sprity.src({
+				src: settings.path().sprites + '/**/*.png',
+				name: 'sprites',
+				style: '_sprite.scss',
+				cssPath: path.relative(path.resolve(settings.path().css), path.resolve(settings.path().images)) + '/',
+				template: 'gulp/sprite-scss-template.mustache',
+				orientation: 'binary-tree',
+				cachebuster: true
+			})
+			.pipe(imagemin())
+			.pipe(gulpif('*.png', gulp.dest(settings.path().images), gulp.dest(settings.path().sass)));
+	}
 });
 
 gulp.task('svg', function() {