[web2py] is_impersonating() as boolean in menu

[Martin Weissenboeck]

I am using "impersonate" (great idea!) and I have a menu item which should
only appear when somebody is impersonated. I wrote

('end impersonate', False, URL('endimpersonate'),[],*auth.is_impersonating()
*)

This did notwork, I had to write

('end impersonate', False, URL('endimpersonate'),[],*
auth.is_impersonating()!=None*)

Why?
Regards, Martin

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