Description of problem:
Tried to Tab-complete `pylint-3 test` in a directory containing the file `test.py`

Version-Release number of selected component:
1:bash-completion-2.8-6.fc30

Additional info:
reporter:       libreport-2.10.1
cmdline:        python3 /usr/share//bash-completion/completions/../helpers/python test.
crash_function: CTETest
exception_type: AttributeError
executable:     /usr/share/bash-completion/helpers/python
interpreter:    python3-3.7.4-1.fc30.x86_64
kernel:         5.2.13-200.fc30.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
test_cte.py:114:CTETest:AttributeError: 'NoneType' object has no attribute 'ctes_with_update_delete'

Traceback (most recent call last):
  File "/usr/share//bash-completion/completions/../helpers/python", line 13, in <module>
    for mod in walker():
  File "/usr/lib64/python3.7/pkgutil.py", line 107, in walk_packages
    yield from walk_packages(path, info.name+'.', onerror)
  File "/usr/lib64/python3.7/pkgutil.py", line 107, in walk_packages
    yield from walk_packages(path, info.name+'.', onerror)
  File "/usr/lib64/python3.7/pkgutil.py", line 92, in walk_packages
    __import__(info.name)
  File "/usr/lib64/python3.7/site-packages/sqlalchemy/testing/suite/__init__.py", line 1, in <module>
    from .test_cte import *  # noqa
  File "/usr/lib64/python3.7/site-packages/sqlalchemy/testing/suite/test_cte.py", line 13, in <module>
    class CTETest(fixtures.TablesTest):
  File "/usr/lib64/python3.7/site-packages/sqlalchemy/testing/suite/test_cte.py", line 114, in CTETest
    @testing.requires.ctes_with_update_delete
AttributeError: 'NoneType' object has no attribute 'ctes_with_update_delete'

Local variables in innermost frame:
__module__: 'sqlalchemy.testing.suite.test_cte'
__qualname__: 'CTETest'
__backend__: True
__requires__: ('ctes',)
run_inserts: 'each'
run_deletes: 'each'
define_tables: <classmethod object at 0x7ff5cf1d5d10>
insert_data: <classmethod object at 0x7ff5cf1cf110>
test_select_nonrecursive_round_trip: <function CTETest.test_select_nonrecursive_round_trip at 0x7ff5cf1d2cb0>
test_select_recursive_round_trip: <function CTETest.test_select_recursive_round_trip at 0x7ff5cf1d6ef0>
test_insert_from_select_round_trip: <function CTETest.test_insert_from_select_round_trip at 0x7ff5cf1d6950>