"-" in mod_rewrite config incorrectly parsed

[display-none]

When filter is configured with mod_rewrite config and such config features a RewriteRule with a dash ("-") as to part, the rule is incorrectly handled.

ModRewriteConfLoader sets rule.to only when it's not equal to "-":

if (partCounter == 2 && !"-".equals(part)) {
    rule.setTo(part);
}

in effect rule.to is null and in RuleBase:

if (StringUtils.isBlank(to) && setAttributes.size() == 0 && runs.size() == 0) {
    addError("to is not valid because it is blank (it is allowed to be blank when there is a 'set' specified)");
} else if ("null".equalsIgnoreCase(to)) {
    stopFilterChainOnMatch = true;
} else if ("-".equals(to)) {
    noSubstitution = true;
}

the first if is executed, not the third.