Refresh doesn't work correctly with minimum-input-length.

[phongdckz]

Bug description:

Ui-select-choices doesn't render option from refresh when deleting and re-inputting the same input with minimum-input-length.

Ex: ui-select has minimum 3 characters.
1: Input 123, it works normally.
2: Delete 123 and re-input it, callback function return result but ui-select-choices does not render anything.

Link to minimally-working plunker that reproduces the issue:
https://plnkr.co/edit/WUXA4tmmoOmazUMj?preview

Version of Angular, UI-Select, and Bootstrap/Select2/Selectize CSS
Angular: 1.5.8
UI-Select:0.19.8
Bootstrap/Select2/Selectize CSS (if applicable): 3.1.1

[chetbis]

have the same issue