Steps to reproduce

• Create an article with a link with a local attachment.
• Save it.
• Edit the article, click on the link, modify it.
• A popup is opened with the following message:

  Error: [Ext.create] Unrecognized class name / alias: Ametys.explorer.ExplorerNode
  create@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:358:382
  _getExplorerNodesCB@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:9564:397
  _callProcessed/<@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:9057:315
  ExtArray.forEach<@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:86:169
  _callProcessed@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:9057:216
  _dispatch/<@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:9072:384
  ExtArray.forEach<@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:86:169
  _dispatch@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:9072:271
  _onRequestComplete@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:9068:67
  callback@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:211:140
  onComplete@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:602:459
  onStateChange@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:601:371
  bindStateChange/</<@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:601:228
  elevate@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:70:271
  bindStateChange/<@https://docs.ametys.org/_plugins/web/resources-minimized/MzUzOTkyNzkz.js:601:206

But it works correctly.