Fix regression caused by automatic Rubocop fixes #355
I only fixed this one specific instance, there may be other regressions caused by the Rubocop cleanup so perhaps the entire commit should be double-checked.
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InputStream: ``` if @current_entry && @current_entry.gp_flags & 8 == 8 && @current_entry.crc == 0 \ && @current_entry.compressed_size == 0 \ && @current_entry.empty? && !@internal ``` `Zip::Entry#empty?` doesn't exist, but an automatic Rubocop check thought it should be converted from `size == 0`. Unfortunately, this is tricky to write a test for as it only fails under some very specific conditions.