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Tooltip: On close and destroy only set title if empty or undefined
Ticket #8925 states that changes to the title attribute while the tooltip is open are lost on tooltip close. In the close and destroy functions, the title attribute is always written if a value was stored in the element on open. It is possible the attribute has changed and restoring the initial value may overwrite the current value. If the value is empty or undefined as set in open, do not set the title attribute. This fix has the limitation that if the user removed the title attribute or set the value to an empty string the original title value would be restored on close and destroy. Fixes #8925
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