fix #2736 - remove explicit check for list as a return value in make_response #2737
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This PR addresses an issue introduced in #2256 which breaks a custom response class that supports returning lists from view functions.
A list is not an expected response value and is not intended to be handled by
make_response
. I'm unsure why it made it's way into this instance check, but there are no consequences to removing it, based on what I can see in the tests & related code.