fix(Selectize): Input box is not hidden when selected data is 0 (as number)

Closes angular-ui#1304

Author: Jefiozie

src/selectize/select.tpl.html

@@ -8,7 +8,7 @@
            ng-click="$select.toggle($event)"
            placeholder="{{$select.placeholder}}"
            ng-model="$select.search"
-           ng-hide="!$select.searchEnabled || ($select.selected && !$select.open)"
+           ng-hide="!$select.searchEnabled || (($select.selected || $select.selected===0) && !$select.open)"
            ng-disabled="$select.disabled"
            aria-label="{{ $select.baseTitle }}">
   </div>