[Rpm-maint] [rpm-software-management/rpm] Ban empty header tag data entries (#1589)

[Demi Marie Obenour]

hdrchkType() incorrectly allowed an entry of type RPM_NULL_TYPE, but
that makes no sense in a header.  Also ensure that dataLength() and
hdrblobVerifyInfo() treat empty tag data entries as errors.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1589

-- Commit Summary --

  * Ban empty header tag data entries

-- File Changes --

    M lib/header.c (9)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1589.patch
https://github.com/rpm-software-management/rpm/pull/1589.diff

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