Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-request/tests/test-pool.js

@@ -0,0 +1,16 @@
+var request = require('../index')
+  , http = require('http')
+  , assert = require('assert')
+  ;
+
+var s = http.createServer(function (req, resp) {
+  resp.statusCode = 200;
+  resp.end('asdf');
+}).listen(8080, function () {
+  request({'url': 'http://localhost:8080', 'pool': false}, function (e, resp) {
+    var agent = resp.request.agent;
+    assert.strictEqual(typeof agent, 'boolean');
+    assert.strictEqual(agent, false);
+    s.close();
+  });
+});