Update Select.vue to handle undefined button case #161
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When the X button has been pressed on the select element then the select component itself is no longer visible for whatever reason, the `$refs.btn` is `undefined`. Check for this to avoid `Uncaught TypeError: Cannot read property 'focus' of undefined`. Note: The use case in this instance for me is having the select component in a tab, when the X is pressed, I change tab thus removing the select component from scope.
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When the X button has been pressed on the select element then the select component itself is no longer visible for whatever reason, the
$refs.btnisundefined. Check for this to avoidUncaught TypeError: Cannot read property 'focus' of undefined.Note: The use case in this instance for me is having the select component in a tab, when the X is pressed, I change tab thus removing the select component from scope.