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'.

[tox]
minversion = 1.8
envlist = py27-pytest

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    -r{toxinidir}/dev_requirements.txt
    python-ldap
    python-pam
commands =
    pytest: py.test {posargs}