Media autocomplete error when not path extractor

Problem/Motivation

Current media autocomplete raise an error when not using a path extractor, for example svg.

Steps to reproduce

Enable ui_icons_test for quick tests.

• Add Media type Icon
• Add field reference to Media on content
• Create content, pick 'Add media'
• Search svg icon and select
• An error occur, no preview is display and ajax error in console logs.