I've modified the patch to add an entry for each implementation that is not found:
Configuration Error
Cannot find an implementation of the IPermissionPolicy interface named MissingPermPolicyOne. Please check that the Component is enabled or update the option [trac] permission_policies in trac.ini.
Cannot find an implementation of the IPermissionPolicy interface named MissingPermPolicyTwo. Please check that the Component is enabled or update the option [trac] permission_policies in trac.ini.
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