[Bug 1210253] Re: With Havana 2 installed, Launching horizon UI results in the error " NameError: name 'Dashboard' is not defined"

[Radomir Dopieralski]

I can still see the contradictory code in horizon/__init__.py. Should that be fixed too?
I mean, if we decide that we do require Dashboard, Panel and PanelGroup, then maybe we should remove the try-except and warnings? If we decide that they are optional after all, then we should remove the asserts?

Also, why asserts, when using __all__ also makes flake8 shut up and
actually is the idiomatic way of telling Python what those modules
should me exposed.

** Changed in: horizon
       Status: Invalid => Incomplete

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Title:
  With Havana 2 installed, Launching horizon UI results in the error "
  NameError: name 'Dashboard' is not defined"

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