ui: look before you leap on sys.stderr.closed (and look nicer)
f83291e5643e introduced a fix if sys.stdout.closed does not exist.
This change uses a getattr with default instead of hasattr (which just calls
getattr) and accessing the attribute.
Additionally it applies the same fix for sys.stderr.closed as this is not
available in the bpython shell (reported by Roger Gammans).
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
% merge heads
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merging l
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(branch merge, don't forget to commit)
% merge working directory
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merging l2
0 files updated, 1 files merged, 0 files removed, 0 files unresolved