config/url_config: use empty git environment if nil given
config/url_config: use empty git environment if nil given

aleb/git-lfs,dakotahawkins/git-lfs,github/git-lfs,Jericho25/-git-lfs_miilkyway,andyneff/git-lfs,aleb/git-lfs,dakotahawkins/git-lfs,andyneff/git-lfs,andyneff/git-lfs,Jericho25/-git-lfs_miilkyway,github/git-lfs,aleb/git-lfs,Jericho25/-git-lfs_miilkyway,github/git-lfs,dakotahawkins/git-lfs