NPE check was added in method  onShow( final TabPanel.ShowEvent e )

It was detected that in some use cases (for example when a new TabPanel was added to the original TabPanel) the method onShow( final TabPanel.ShowEvent e ) throws an NPE.
The fix basically adds the same tra/catch that already existed for the fist handler.



This seems like a really bad practice, swallowing the exception. I don't really know what's going on in this particular case, but if there are objective reasons to swallow the exception, please add a comment that explains them, so people reading the code won't be tempted to "fix" it.