cbind on null.dt to non-null.dt now works, closes #3445

[jangorecki]

closes #3445

[codecov]

Codecov Report

Merging #3446 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3446      +/-   ##
==========================================
+ Coverage   95.13%   95.14%   +<.01%     
==========================================
  Files          65       65              
  Lines       12303    12307       +4     
==========================================
+ Hits        11705    11709       +4     
  Misses        598      598

Impacted Files	Coverage Δ
R/utils.R	91.66% <100%> (+0.17%)	⬆️
R/data.table.R	97.48% <100%> (ø)	⬆️

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[codecov]

Codecov Report

Merging #3446 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3446      +/-   ##
==========================================
+ Coverage   96.14%   96.14%   +<.01%     
==========================================
  Files          65       65              
  Lines       12193    12194       +1     
==========================================
+ Hits        11723    11724       +1     
  Misses        470      470

Impacted Files	Coverage Δ
R/utils.R	91.48% <ø> (ø)	⬆️
R/data.table.R	97.53% <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 f25b7ae...f234fe8. Read the comment docs.