Note: this only happens on the ICEfaces 4 code base.

r49365: added checks to only unbind the resize callbacks from the window if they have already been defined, in order to avoid unbinding all resize callbacks of all tables (and other components) on the page

Because the destroy() method is always called before initializing a table, and that destroy() method unbinds all the resize callbacks of the table from the window object, but those callbacks aren't defined yet at that point, then all resize callbacks where being removed from the window object, so only the last table got to keep its resize listeners. This was fixed by first checking that these callbacks are defined, before unbinding them.

Verified ICEfaces4 trunk r 49367 with attached test case on IE11, MS Edge38, Chrome53, FF47.
Ran all ace:dataTable QA tests on FF47; verified manually column alignment on dataTable with Paginator tests (IE11, MS Edge38, FF47, Chrome53).