Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

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

@@ -0,0 +1,37 @@
+var server = require('./server')
+  , events = require('events')
+  , assert = require('assert')
+  , request = require('../index')
+  ;
+
+var local = 'http://localhost:8888/asdf'
+
+try {
+  request({uri:local, body:{}})
+  assert.fail("Should have throw") 
+} catch(e) {
+  assert.equal(e.message, 'Argument error, options.body.')
+}
+
+try {
+  request({uri:local, multipart: 'foo'})
+  assert.fail("Should have throw")
+} catch(e) {
+  assert.equal(e.message, 'Argument error, options.multipart.')
+}
+
+try {
+  request({uri:local, multipart: [{}]})
+  assert.fail("Should have throw")
+} catch(e) {
+  assert.equal(e.message, 'Body attribute missing in multipart.')
+}
+
+try {
+  request(local, {multipart: [{}]})
+  assert.fail("Should have throw")
+} catch(e) {
+  assert.equal(e.message, 'Body attribute missing in multipart.')
+}
+
+console.log("All tests passed.")