Have a violent reaction when out of emoji

Failing explicitly is better than silently starting to return empty strings.

Author: asmundg

lib/interpolateName.js

@@ -12,8 +12,12 @@ function encodeStringToEmoji(content, length) {
 	if(emojiCache[content]) return emojiCache[content];
 	length = length || 1;
 	const emojis = [];
-	do {
-		const index = Math.floor(Math.random() * emojiList.length);
+    do {
+        if (!emojiList.length) {
+            throw new Error("Ran out of emoji");
+        }
+
+	    const index = Math.floor(Math.random() * emojiList.length);
 		emojis.push(emojiList[index]);
 		emojiList.splice(index, 1);
 	} while(--length > 0);