Lintian tag information: doc-base-file-no-index (type: error)

Description (from lintian-explain-tags)

The Format sections in the given doc-base control files for HTML or Info
documents must also contain an Index field that shows an appropriate
starting point for the document series.

The field must be present even if the documentation is a single file.

Please refer to Format sections (Section 2.3.2.2) in the Debian doc-base
Manual for details.

Visibility: error
Show-Always: no
Check: menus

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