Make hint values optional, fixes issue 2356
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@ -134,7 +134,7 @@ struct BaseParametersGrammar : boost::spirit::qi::grammar<Iterator, Signature>
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hints_rule
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= qi::lit("hints=")
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> qi::as_string[qi::repeat(engine::ENCODED_HINT_SIZE)[base64_char]][ph::bind(add_hint, qi::_r1, qi::_1)] % ';'
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> -qi::as_string[qi::repeat(engine::ENCODED_HINT_SIZE)[base64_char]][ph::bind(add_hint, qi::_r1, qi::_1)] % ';'
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;
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bearings_rule
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