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Replace undefined value with empty one (processone/ejabberd-contrib#92)
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@ -444,6 +444,8 @@ format_arg(Arg, binary) when is_list(Arg) -> list_to_binary(Arg);
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format_arg(Arg, binary) when is_binary(Arg) -> Arg;
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format_arg(Arg, string) when is_list(Arg) -> Arg;
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format_arg(Arg, string) when is_binary(Arg) -> binary_to_list(Arg);
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format_arg(undefined, binary) -> <<>>;
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format_arg(undefined, string) -> "";
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format_arg(Arg, Format) ->
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?ERROR_MSG("don't know how to format Arg ~p for format ~p", [Arg, Format]),
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throw({error_formatting_argument, Arg, Format}).
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