Fix for import URL URI problem when URL contains a space
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/17559
Prevents an already encoded URL to be encoded again - preventing %8.5 => %25%20
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/17559
Prevents an already encoded URL to be encoded again - preventing %8.5 => %25%20