fix(editors): Editors should work with undefined item properties

[ghiscoding]

No description provided.

[codecov]

Codecov Report

Merging #540 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #540   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          148       148           
  Lines         9663      9663           
  Branches      3377      3397   +20     
=========================================
  Hits          9663      9663           

Impacted Files	Coverage Δ
...es/angular-slickgrid/editors/autoCompleteEditor.ts	100.00% <100.00%> (ø)
...odules/angular-slickgrid/editors/checkboxEditor.ts	100.00% <100.00%> (ø)
...pp/modules/angular-slickgrid/editors/dateEditor.ts	100.00% <100.00%> (ø)
...dules/angular-slickgrid/editors/dualInputEditor.ts	100.00% <100.00%> (ø)
...p/modules/angular-slickgrid/editors/floatEditor.ts	100.00% <100.00%> (ø)
...modules/angular-slickgrid/editors/integerEditor.ts	100.00% <100.00%> (ø)
...odules/angular-slickgrid/editors/longTextEditor.ts	100.00% <100.00%> (ø)
.../modules/angular-slickgrid/editors/selectEditor.ts	100.00% <100.00%> (ø)
.../modules/angular-slickgrid/editors/sliderEditor.ts	100.00% <100.00%> (ø)
...pp/modules/angular-slickgrid/editors/textEditor.ts	100.00% <100.00%> (ø)

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