Fix setValue incorrectly assuming there is a change when there is none #26
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When using the component with multiple set to true and there are no option selected, the setValue call will incorrectly assume there is a change (and trigger a change event) because jquery val method returns null instead of an empty array.
This can trigger an infinite loop if you have a controlled component where the state of the host component is synchronized with the selected elements (hosting component will receive the change, update its state and then send the updated state = [] to the component)
Fix consist in checking if the select is in multiple mode and if so, ensuring we return an empty array in case there is no option selected.