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fix ValueError for click>=8.0

Lukas Erhard requested to merge luerhard/pandoc-acronyms:fix_click into master

Since click version 8.0, the following error occurs:

Traceback (most recent call last):
  File "/home/lukas/.local/bin/pandoc-acronyms", line 5, in <module>
    from filter.pandocacronyms import filter
  File "/home/lukas/.local/lib/python3.9/site-packages/filter/pandocacronyms.py", line 18, in <module>
    def filter(acronyms, verbose, suggest, error, debug, format):
  File "/home/lukas/.local/lib/python3.9/site-packages/click/decorators.py", line 247, in decorator
    _param_memo(f, OptionClass(param_decls, **option_attrs))
  File "/home/lukas/.local/lib/python3.9/site-packages/click/core.py", line 2465, in __init__
    super().__init__(param_decls, type=type, multiple=multiple, **attrs)
  File "/home/lukas/.local/lib/python3.9/site-packages/click/core.py", line 2099, in __init__
    raise ValueError(
ValueError: 'default' must be a list when 'multiple' is true.

This uses [''] instead of '' as default parameter and fixes that issue

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