R4R: Return on zero-length byte array input

[cwgoes]

Closes #3727

cc @mossid

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Wrote tests
• Updated relevant documentation (docs/)
• Added entries in PENDING.md with issue #
• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[mossid]

LGTM :+1

[codecov]

Codecov Report

Merging #3745 into develop will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop    #3745      +/-   ##
===========================================
- Coverage    61.15%   61.13%   -0.02%     
===========================================
  Files          189      189              
  Lines        14052    14052              
===========================================
- Hits          8593     8591       -2     
- Misses        4921     4923       +2     
  Partials       538      538