Fix problem in high-verbosity mode #98
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Add an if-clause to verify the existence of `article_info_file` before trying to `cat` the file to prevent errors when no `article_info_file` is specified by the user.
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Currently, when verbosity is greater/equal 2 and no
article_info_fileis specified via the-moption, the script fails as it tries tocatthe file without checking whetherarticle_info_fileis specified.This PR adds an if-clause to perform this check beforehand and prevent errors in high-verbosity mode.