iptables: fix param check in append_csv function
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@ -238,7 +238,7 @@ def append_param(rule, param, flag, is_list):
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def append_csv(rule, param, flag):
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def append_csv(rule, param, flag):
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if param is not None:
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if param:
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rule.extend([flag, ','.join(param)])
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rule.extend([flag, ','.join(param)])
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