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changehost: more friendly error when an expansion field is unavailable
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@ -55,7 +55,11 @@ def _changehost(irc, target, args):
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# you're careful with what you're doing, and that is why this
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# hidden option exists. -GLolol
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new_host = template.substitute(args)
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try:
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new_host = template.substitute(args)
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except KeyError as e:
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log.warning('(%s) Bad expansion %s in template %s' % (irc.name, e, host_template))
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continue
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# Replace characters that are not allowed in hosts with "-".
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for char in new_host:
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