Fix for #183

[doug-martin]

• Changed AppendSQL to set error if one is present

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (v9.5.1-rc@20ea999). Click here to learn what that means.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             v9.5.1-rc     #187   +/-   ##
============================================
  Coverage             ?   96.25%           
============================================
  Files                ?       56           
  Lines                ?     4003           
  Branches             ?        0           
============================================
  Hits                 ?     3853           
  Misses               ?      135           
  Partials             ?       15

Impacted Files	Coverage Δ
insert_dataset.go	100% <100%> (ø)
delete_dataset.go	100% <100%> (ø)
select_dataset.go	100% <100%> (ø)
update_dataset.go	100% <100%> (ø)

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