Commit 0da818bb6bdd701ed29da53d7c8506b81d7d1044 in isis's branch refs/heads/
ISIS-1613 from Dan Haywood
[ https://git-wip-us.apache.org/repos/asf?p=isis.git;h=0da818b ]
ISIS-1613: fixes no-arg actions, was hitting an NPE
... as the result of attempting to infer the current page from feedbackForm (that was null when no prompt).
Instead, have the FormExecutor ask for the page via its method (executeAndProcessResults).
This in turn requires building ActionParametersPanel's GUI using onInitialize() rather than constructor, so able to get hold of the panel's owning page so can pass down to the FormExecutor