Selection Plugin - Allow multiple Empty String values in StaticDropDown

Improvement is tested with selection plugin version 2.28.02 in selection demo project.
If empty strings are placed like shown below then it works properly in static drop down and empty string is preserved :--
1 ,a,b,c
2 a,b,,c
3 a,b,c,
But when empty string is placed in combination,then only the empty string which is before gets preserved in the dropdown and the later one is ignored.
eg.1 ,a,b,c, (expecting two empty string but shown only one before "a" in dropdown)
2 a,b,,c, (expecting two empty string but shown only one before "c" in dropdown)
3. ,a,b,,c, (expecting three empty string but shown only one before "a" in dropdown)
4. ,a,b,,c (expecting two empty string but shown only one before "a" in dropdown)