Lintian tag information: ambiguous-paragraph-in-dep5-copyright (type: warning)

Description (from lintian-explain-tags)

The paragraph has both License and Copyright fields, but no Files field.
The paragraph is technically valid according to the DEP 5 specification,
but it is probably a mistake.

If the paragraph is a "stand-alone" license paragraph, the Copyright field
is not needed. If it is, on the other hand, "files" paragraph, the Files
field is missing.

The Files field was at some point optional in some circumstances but is
now mandatory in all "files" paragraphs.

Please refer to Bug#652380 and
https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/ for
details.

Visibility: warning
Show-Always: no
Check: debian/copyright/dep5

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