ipatests: Allow zero-length arguments
Currently, such arguments are eaten by 'ipa-run-tests' script as they
are not quoted.
For example, running ipa-run-tests -k ''
results in the actual invocation would be like as:
['/bin/sh',
'--norc',
'--noprofile',
'-c',
'--',
"/usr/bin/python3 -c 'import sys,pytest;sys.exit(pytest.main())' -o "
'cache_dir=/tmp/pytest-of-root/pytest-12/test_ipa_run_tests_empty_expression0/.pytest_cache '
'--confcutdir=/usr/lib64/python3/site-packages/ipatests -k ']
Note: expressions or marks could be empty as a result of the building
of command line args by more high-level tools, scripts, etc.
So, a short-termed solution is the quotting of zero-length arguments.
Fixes: https://pagure.io/freeipa/issue/8173
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>