Hello Steven Reid,
You cannot get null exception because in the sample there is the following if
(sender.argument.attributes && sender.argument.attributes[
] != undefined)
as you can see from the js both cases for null are escaped, so the code should not reach
. It should step in
] != undefined
becase the argument is "src"
when you work with PagesSelector. The external pages are added as items to the tree of PagesSelector so you can get their Url.
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