If the `.gitmodules` contains a URL entry of the form: ``` url = git@gitlab.com:<fork>/internal.git ``` `<fork>` will be interpreted as a namespace, which is not allowed. We should be ignoring these invalid namespaces. https://sentry.gitlap.com/gitlab/gitlabcom/issues/34906/ ``` ActionController::UrlGenerationError: No route matches {:action=>"show", :controller=>"projects", :id=>"internal", :namespace_id=>"<fork>"} missing required keys: [:namespace_id] app/helpers/submodule_helper.rb:31:in `submodule_links' [namespace_project_path(namespace, project), app/helpers/diff_helper.rb:91:in `submodule_link' tree, commit = submodule_links(blob, ref, repository) app/views/projects/tree/_submodule_item.html.haml:4:in `_app_views_projects_tree__submodule_item_html_haml___1108542384982106369_69942426556000' = submodule_link(submodule_item, @ref) app/views/projects/tree/_tree_row.html.haml:6:in `_app_views_projects_tree__tree_row_html_haml___889434624970704751_69942426086340' = render partial: 'projects/tree/submodule_item', object: tree_row, as: 'submodule_item' app/helpers/tree_helper.rb:11:in `render_tree' tree << render(partial: "projects/tree/tree_row", collection: items) if items.present? ... (211 additional frame(s) were not displayed) ActionView::Template::Error: No route matches {:action=>"show", :controller=>"projects", :id=>"internal", :namespace_id=>"<fork>"} missing required keys: [:namespace_id] ActionView::Template::Error: No route matches {:action=>"show", :controller=>"projects", :id=>"internal", :namespace_id=>"<fork>"} missing required keys: [:namespace_id] ```