Do not show inline blame information on empty lines (#11294)

cc @iamnbutler 

Release Notes:

- Changed inline git blame information to not show up on empty lines.

Demo/proof:



https://github.com/zed-industries/zed/assets/1185253/e506cf1f-81b1-407b-8dc7-1666b31ae142
23f191450eThorsten Ball committed on 5/2/2024, 10:22:51 AM· committed by GitHubparentedff78e
1 file changedLine totals unavailable