hg: handle Mercurial RepoError correctly in is_valid_repo_uri RepoError would be leaked by is_valid_repo_uri. Now, when for example validating an ssh URL without having the ssh client binary, it will be shown/logged as: remote: /bin/sh: ssh: command not found 2020-03-17 17:28:53.907 WARNI [kallithea.model.validators] validation of clone URL 'ssh://no-ssh.com/' failed: Mercurial RepoError: no suitable response from remote hg and shown in the UI as 'Invalid repository URL'.

pytest >= 4.6.6, < 5.4
pytest-sugar >= 0.9.2, < 0.10
pytest-benchmark >= 3.2.2, < 3.3
pytest-localserver >= 0.5.0, < 0.6
mock >= 3.0.0, < 4.1
Sphinx >= 1.8.0, < 2.4
WebTest >= 2.0.6, < 2.1
isort == 4.3.21
pyflakes == 2.1.1