Fix fileUpload while contentType: "multipart/form-data"

[saharj]

Fixes #599

Browsers I manually tested this feature in

• Google Chrome

[NeoElit]

Hi,
I'm not so familiar with npm. I wanted to create a local release from master for this fix. Is that possible? Something like this https://github.com/swagger-api/swagger-editor/releases/download/v2.10.4/swagger-editor.zip
Currently I've cloned master and running npm start which takes a long time to build at first.
Can anyone point me in the right docs or anything i can look into?

Sorry it was in the doc: npm run build

[NeoElit]

Also multipart form submits 'undefined' for empty fields.
These are my request params:

parameters:
        - name: id
          in: path
          description: Id of the Place
          required: true
          type: number
          format: integer
        - name: 'media[media]'
          in: formData
          type: file
          description: 'Attachment media data, if local'
          required: false
        - name: 'media[remote_source_url]'
          in: formData
          type: string
          description: 'Url of the media source, if not a local media'
          required: false

When field for media[remote_source_url] is left empty, it's sending undefined to server as value