fixup last separator condition

Author: archmoj

src/lib/index.js

@@ -1250,12 +1250,13 @@ lib.ensureUniformFontSize = function(gd, baseFont) {
  *
  * @param {array} arr : the array to join
  * @param {string} mainSeparator : main separator
+ * @param {string} lastSeparator : last separator
  *
  * @return {string} : joined list
  */
 lib.join2 = function(arr, mainSeparator, lastSeparator) {
     var len = arr.length;
-    if(len > 1 && lastSeparator) {
+    if(len > 1) {
         return arr.slice(0, -1).join(mainSeparator) + lastSeparator + arr[len - 1];
     }
     return arr.join(mainSeparator);