Inserting snippet into user's snippets fails (multi-repository workspaces)

Summary

When a user tries to add a snippet to their user snippets (rather than project snippets) the command fails.

Steps to reproduce

User tries to add a snippet to their user snippets (rather than project snippets):

1. Open folder containing multiple repositories
2. Open file from one of the repositories
3. Trigger the GitLab: Create snippet command
4. Select User's Snippets in the project selection
5. See the command fail

Possible fixes

I added all caps comments to the following snippet from create_snippet.js

async function createSnippet() {
  const editor = vscode.window.activeTextEditor;
  let repositoryRoot = null;
  let project = null;

  if (editor) {
    const repository = gitExtensionWrapper.getActiveRepository();
    repositoryRoot = repository && repository.rootFsPath;
    try {
      project = repository && (await repository.getProject());
    } catch (e) {
      logError(e);
    }

    // FIXME: the empty `uri` representing user's snippets is not correctly handled
    if (!project) {
      repositoryRoot = await gitlabProjectInput.show(
        [
          {
            label: "User's Snippets",
            uri: '', // HERE WE RETURN EMPTY STRING
          },
        ],
        "Select a Gitlab Project or use the User's Snippets",
      );
      try {
        const selectedRepository = gitExtensionWrapper.getRepository(repositoryRoot); // HERE WE EXPECT SOME VALID URL
        project = selectedRepository && (await selectedRepository.getProject());
      } catch (e) {
        logError(e);
      }
    }

    const visibility = await vscode.window.showQuickPick(visibilityOptions);

    if (visibility) {
      const context = await vscode.window.showQuickPick(contextOptions);

      if (context) {
        uploadSnippet(project, editor, visibility.type, context.type, repositoryRoot); // THIS FUNCTION NEEDS VALID repositoryRoot
      }
    }
  } else {
    vscode.window.showInformationMessage('GitLab Workflow: No open file.');
  }
}