Lintian tag information: zero-byte-file-in-doc-directory (type: warning)

Description (from lintian-explain-tags)

The documentation directory for this package contains an empty file. This
is often due to installing an upstream NEWS or README file without
realizing it's empty and hence not useful.

Files in the examples subdirectory are excluded from this check, but there
are some cases where empty files are legitimate parts of the documentation
without being examples. In those cases, please add an override.

Visibility: warning
Show-Always: no
Check: documentation

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