Fixed issue with error message not appearing
Fixed issue with error message not appearing

Fix due to issue #24. Because the #additives route redirects to
 #additives/category1 the 'route-found' event is triggered twice. This
 effectively hides the error dialog box. The 'changed' sammyjs event is
 used now. This event is triggered only when content of the pane div is
 about to change.

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