fix failing to build without .git directory

gulpfile.js

@@ -4,6 +4,7 @@ var browserSync = require('browser-sync');
 var del = require('del');
 var fs = require('fs');
 var git = require('git-rev-sync');
+var tryFn = require('nice-try');
 
 var $ = gulpLoadPlugins();
 var reload = browserSync.reload;
@@ -56,7 +57,7 @@ gulp.task('prepare-scripts', function () {
         'src/scripts/**/*.js'
     ]).pipe($.plumber())
         .pipe($.injectVersion({replace: '${ARIANG_VERSION}'}))
-        .pipe($.replace(/\${ARIANG_BUILD_COMMIT}/g, git.short()))
+        .pipe($.replace(/\${ARIANG_BUILD_COMMIT}/g, tryFn(git.short) || 'Local'))
         .pipe(gulp.dest('.tmp/scripts'))
         .pipe(reload({stream: true}));
 });

package-lock.json

@@ -7652,6 +7652,12 @@
       "integrity": "sha1-yobR/ogoFpsBICCOPchCS524NCw=",
       "dev": true
     },
+    "nice-try": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/nice-try/-/nice-try-2.0.0.tgz",
+      "integrity": "sha512-/o4KoXbUkEjD2NDwvBCkSzEDOfMuHPmbzSD5Pp2Bb5U/69MnEvpc4YfW2Y1BJqJpcaam04+fR0kF8n5xm8b6MQ==",
+      "dev": true
+    },
     "no-case": {
       "version": "2.3.2",
       "resolved": "https://registry.npmjs.org/no-case/-/no-case-2.3.2.tgz",

package.json

@@ -61,7 +61,8 @@
     "gulp-size": "^3.0.0",
     "gulp-sourcemaps": "^2.6.5",
     "gulp-uglify": "^2.1.2",
-    "gulp-useref": "^3.1.6"
+    "gulp-useref": "^3.1.6",
+    "nice-try": "^2.0.0"
   },
   "name": "ariang",
   "description": "AriaNg, a modern web frontend making aria2 easier to use.",