lint: attribute pool

src/static/js/AttributePool.js

@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * This code represents the Attribute Pool Object of the original Etherpad.
  * 90% of the code is still like in the original Etherpad
@@ -70,9 +72,11 @@ AttributePool.prototype.getAttribValue = function (num) {
 
 AttributePool.prototype.eachAttrib = function (func) {
   for (const n in this.numToAttrib) {
+    if (this.numToAttrib[n]) {
       const pair = this.numToAttrib[n];
       func(pair[0], pair[1]);
     }
+  }
 };
 
 AttributePool.prototype.toJsonable = function () {
@@ -87,8 +91,10 @@ AttributePool.prototype.fromJsonable = function (obj) {
   this.nextNum = obj.nextNum;
   this.attribToNum = {};
   for (const n in this.numToAttrib) {
+    if (this.numToAttrib[n]) {
       this.attribToNum[String(this.numToAttrib[n])] = Number(n);
     }
+  }
   return this;
 };