Return full table for !all(FALSE) with subset

[MichaelChirico]

Closes #3013
Closes #2917

Problem as correctly identified by @DavidArenburg in the issue

[codecov]

Codecov Report

Merging #3829 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #3829   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files          71       71           
  Lines       13416    13416           
=======================================
  Hits        13339    13339           
  Misses         77       77

Impacted Files	Coverage Δ
R/data.table.R	100% <100%> (ø)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #3829 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #3829   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files          71       71           
  Lines       13399    13399           
=======================================
  Hits        13322    13322           
  Misses         77       77

Impacted Files	Coverage Δ
R/data.table.R	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 27f7516...ca196b0. Read the comment docs.

[jangorecki]

LGTM