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wireprotov1server: capture Abort type before accessing the `hint` attribute

Authored by mharbison72.

Description

wireprotov1server: capture Abort type before accessing the hint attribute

Although the previous code worked, pytypes complained because exc is caught
above as BundleValueError, Abort, PushRaced, and the other two don't have this
attribute.

Differential Revision: https://phab.mercurial-scm.org/D7463