scons: make things work when EXTRAS is not defined.
--HG-- extra : convert_revision : 83562b55ec099e609c64cd42eb47a8481e4e85e7
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@ -436,6 +436,8 @@ all_cpu_list.sort()
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default_cpus.sort()
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def ExtraPathValidator(key, val, env):
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if not val:
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return
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paths = val.split(':')
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for path in paths:
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path = os.path.expanduser(path)
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