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Cloudinary using a string value instead of an array when selecting a single image

See original GitHub issue

Describe the bug This issue is the same as the one described here #2573

When selecting 2 images via Cloudinary media_library, the image strings are saved in markdown as an array. When selecting 1 image, it is saved in markdown as a string.

To Reproduce

Use the following configuration

backend:
  name: git-gateway
  branch: master

local_backend: true

media_library:
  name: cloudinary
  config:
    cloud_name: #REPLACE-THIS
    api_key: #REPLACE-THIS

media_folder: static/img
public_folder: /img

collections:
  - name: "items"
    editor:
      preview: false
    label: "items"
    folder: "content/items"
    create: true
    slug: "{{slug}}"
    fields:
      - { label: "Name", name: "title", widget: "string" }
      - label: "multiple images"
        name: "images"
        widget: "image"
        media_library:
          config:
            multiple: true

Create a new item with two images
Create a new item with a single image
You should have 2 new files

---
title: One
images:
 - https://res.cloudinary.com/chromjs/image/upload/v1623377465/laptop1_xzo5ac.jpg
 - https://res.cloudinary.com/chromjs/image/upload/v1623194500/sample.jpg
---

---
title: Two
images: https://res.cloudinary.com/chromjs/image/upload/v1623377465/laptop1_xzo5ac.jpg
---

Expected behavior Item “Two” should be an array of a single item

I created a repo with the minimal configuration: https://github.com/chromjs/cloudinary_array_issue

Applicable Versions:

    "gatsby": "^3.13.0",
    "gatsby-plugin-netlify-cms": "^5.13.0",
    "netlify-cms-app": "^2.15.44",
    "netlify-cms-media-library-cloudinary": "^1.3.10",
    "react": "^17.0.1",
    "react-dom": "^17.0.1"

CMS configuration

backend:
  name: git-gateway
  branch: master

local_backend: true

media_library:
  name: cloudinary
  config:
    cloud_name: #REPLACE-THIS
    api_key: #REPLACE-THIS

media_folder: static/img
public_folder: /img

collections:
  - name: "items"
    editor:
      preview: false
    label: "items"
    folder: "content/items"
    create: true
    slug: "{{slug}}"
    fields:
      - { label: "Name", name: "title", widget: "string" }
      - label: "multiple images"
        name: "images"
        widget: "image"
        media_library:
          config:
            multiple: true