get_dynamic_class_hook() doesn't work for inlined callls

[ilevkivskyi]

This is currently supported using get_dynamic_class_hook():

Base = some.custom_class('Base', ...)

class Model(Base):
    ...

But it doesn't work if the call is inlined, which can often be annoying:

class Model(some.custom_class('Base', ...)):  # the hook is not called here
    ...

We can support the second use case by calling the same hook with the l.h.s. name set to None.