Suppress blank casefold to prevent spurious folding

modules/http/chan_commands.pike

@@ -315,6 +315,7 @@ echoable_message _validate(echoable_message resp, mapping state)
 			if (resp[key]) ret[key] = resp[key];
 		ret->otherwise = _validate(resp->otherwise, state);
 		if (ret->message == "" && ret->otherwise == "") return ""; //Conditionals can omit either message or otherwise, but not both
+		if (ret->casefold == "") m_delete(ret, "casefold"); //Blank means not case folded, so omit it
 		if (ret->conditional == "cooldown") {
 			ret->cdname = normalize_cooldown_name(ret->cdname, state);
 			ret->cdlength = (int)ret->cdlength;