[openy_map_lb] Amenities filters fail with content types that don't have amenities field

[froboy]

To test:

• create a Location Finder LB page
• add some Camp content (which doesn't have field_amenities on the content type)
• use the location filters
• observe console error

  Uncaught TypeError: Cannot read properties of undefined (reading 'length') at map.js:1149:29

[andrebonon]

This bug happens when a Camp is unpublish in English but published in other languages (FR for example). I captured the same bug but I proposed a fix in a different way here: https://github.com/open-y-subprojects/openy_custom/issues/68

After the issue above gets merged, we'd need to edit the OpenyMapDataWrapper class that extends from DataWrapper, and replicate the solution with Language manager and a new condition for the query. https://github.com/open-y-subprojects/openy_map/blob/main/src/OpenyMapDataWrapper.php#L23