isEmpty doesn't check for empty objects

[Grohden]

I'm currently having problems to show my placeholder, my default model is a empty object, and i need it that way. But ui select doesn't validate empty objects.

Here are the lines that validate that:

ui-select/dist/select.js

Lines 366 to 368 in 32829a3

	ctrl.isEmpty = function() {
	return isNil(ctrl.selected) || ctrl.selected === '' || (ctrl.multiple && ctrl.selected.length === 0);
	};

A equals comparation would solve that angular.equals(ctrl.selected, {}) and show the placeholder.