Improve introspection of page instance in IPageRequestHandler
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Key: WICKET-3963
URL: https://issues.apache.org/jira/browse/WICKET-3963
Project: Wicket
Issue Type: New Feature
Reporter: Igor Vaynberg
Fix For: 1.5-RC6
it is useful to know whether or not a IPageRequestHandler has a page instance
ready to go or if one will be created when #getPage() is called.
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