feat: warn out when failing to get url on cli

Also cleaned up js uglify process as it was failing the test source.body when in fact there was a body, it was just empty.

cli/index.js

@@ -53,6 +53,10 @@ function main() {
     pkg: defaults(pkg, { version: '0.0.0' }),
   }).notify();
 
+  inliner.on('warning', function progress(event) {
+    console.warn('warning: ' + event);
+  });
+
   if (argv.verbose) {
     inliner.on('progress', function progress(event) {
       console.error(event);

lib/get.js

@@ -7,6 +7,7 @@ var mime = require('mime');
 var cache = {};
 
 module.exports = function get(url, options) {
+  var inliner = this;
   if (url.indexOf('data:') === 0) {
     debug('asset already inline', url);
     return Promise.resolve({
@@ -61,6 +62,7 @@ module.exports = function get(url, options) {
       debug('response: %s %s', res.statusCode, url);
       if (res.statusCode !== 200) {
         body = '';
+        inliner.emit('warning', res.statusCode + ' on ' + url);
       }
 
       resolve({

lib/index.js

@@ -146,10 +146,6 @@ function main() {
     var cheerioLoadOptions = {};
     var enc = inliner.options.encoding;
 
-    if (res.statusCode !== 200) {
-      inliner.emit('progress', res.statusCode + ' on ' + url);
-    }
-
     // try to determine the encoding from the headers and the body
     if (!enc) {
       enc = charset(res.headers, res.body);

lib/javascript.js

@@ -6,16 +6,17 @@ var UglifyJS = require('uglify-js');
 function uglify(source) {
   this.emit('progress', 'compressing javascript');
 
-  if (source.body === '') {
-    return '';
-  }
-
-  if (source.body) {
+  if (source.body !== undefined) {
     source = source.body;
   }
 
   // in case of local buffer
   source = source.toString();
+
+  if (source.trim() === '') {
+    return '';
+  }
+
   debug('uglifying %sbytes', source.length);
 
   return UglifyJS.minify(source, {