Vulnerability processing should ignore software without version (#14612)

#13615

- [X] Changes file added for user-visible changes in `changes/` or
`orbit/changes/`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- ~[ ] Documented any API changes (docs/Using-Fleet/REST-API.md or
docs/Contributing/API-for-contributors.md)~
- ~[ ] Documented any permissions changes (docs/Using
Fleet/manage-access.md)~
- ~[ ] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)~
- ~[ ] Added support on fleet's osquery simulator `cmd/osquery-perf` for
new osquery data ingestion features.~
- [X] Added/updated tests
- [X] Manual QA for all new/changed functionality
  - ~For Orbit and Fleet Desktop changes:~
- ~[ ] Manual QA must be performed in the three main OSs, macOS, Windows
and Linux.~
- ~[ ] Auto-update manual QA, from released version of component to new
version (see [tools/tuf/test](../tools/tuf/test/README.md)).~

docs/Using Fleet/Vulnerability-Processing.md

@@ -301,6 +301,8 @@ With a somewhat normalized list of software, in order to search CVEs for it, we
 
 As described briefly above, we do this by translating the NVD database of CPEs into a [sqlite database that helps Fleet do the lookup of CPEs very quickly](https://github.com/fleetdm/nvd).
 
+NOTE: Software that was ingested with an empty `version` field will be ignored by the NVD vulnerability processing.
+
 #### How accurate is this translation process?
 
 This is the most error prone part of the process.