HookNode: allow __repr__() when size is None.
HookNode: allow __repr__() when size is None.

tyb0807/angr,iamahuman/angr,schieb/angr,angr/angr,chubbymaggie/angr,angr/angr,axt/angr,chubbymaggie/angr,iamahuman/angr,angr/angr,schieb/angr,iamahuman/angr,chubbymaggie/angr,tyb0807/angr,schieb/angr,axt/angr,axt/angr,f-prettyland/angr,tyb0807/angr,f-prettyland/angr,f-prettyland/angr