SKIP_PATTERN(self.lines[err.lnum - 1]): "IndexError: list index out of range" when parsing empty file

[Grische]

Starting with version 8.3.4 (or 8.3.5), pylama throws an IndexError when an empty Python file is present in the repository.

Traceback (most recent call last):
  File "/root/.local/share/virtualenvs/testrepo-a7DjncKn/bin/pylama", line 8, in <module>
    sys.exit(shell())
  File "/root/.local/share/virtualenvs/testrepo-a7DjncKn/lib/python3.7/site-packages/pylama/main.py", line 119, in shell
    rootdir=CURDIR,
  File "/root/.local/share/virtualenvs/testrepo-a7DjncKn/lib/python3.7/site-packages/pylama/main.py", line 68, in check_paths
    errors += run(path=path, code=code, rootdir=rootdir, options=options)
  File "/root/.local/share/virtualenvs/testrepo-a7DjncKn/lib/python3.7/site-packages/pylama/core.py", line 41, in run
    ctx.push(source=lname, **err_info)
  File "/root/.local/share/virtualenvs/testrepo-a7DjncKn/lib/python3.7/site-packages/pylama/context.py", line 107, in __exit__
    self.push(lnum=1, col=1, text=str(evalue))
  File "/root/.local/share/virtualenvs/testrepo-a7DjncKn/lib/python3.7/site-packages/pylama/context.py", line 184, in push
    if SKIP_PATTERN(self.lines[err.lnum - 1]):
IndexError: list index out of range

This can be easily reproduced by creating an empty repository, putting an empty test.py file into it, and adding the following pylama.ini:

[pylama]
linters = pydocstyle

[Velikiy Prikalel]

Have the same issue.