Hide map for items without geometry

[vprivat-ads]

This makes little sense to display an empty map for items without geometry, so this PR hides the map in this case.

[m-mohr]

Thanks, but this may lead to issues as you can't show assets or other data on the map any longer. Even though there's no geometry, there could still be data to show. This would need to show the map again once interactions with assets (e.g. Show on Map button) are happening.
This will be somewhat tackled by #535 already, too, and we should focus effort on this PR to improve it in the long run. Thus closing in favor of #535.

[vprivat-ads]

Ah yes thanks, I didn't see it was also addressing this issue.