Fix a bug that caused memory usage to skyrocket because 0 is a meanie

assets/json/roman-numeral.json

@@ -11,6 +11,5 @@
 	"IX": 9,
 	"V": 5,
 	"IV": 4,
-	"I": 1,
-	"_nulla_": 0
+	"I": 1
 }

commands/number-edit/roman-numeral.js

@@ -22,6 +22,7 @@ module.exports = class RomanNumeralCommand extends Command {
 	}
 
 	run(msg, { number }) {
+		if (number === 0) return msg.say('_nulla_');
 		let result = '';
 		for (const [numeral, value] of Object.entries(numerals)) {
 			while (number >= value) {