🔀 Merge with upstream

Author: zihan21206

runestone/hparsons/js/blockGrader.js

@@ -6,6 +6,7 @@
 export default class BlockBasedGrader {
     constructor(problem) {
         this.problem = problem;
+        this.percent = 0;
     }
     // Use a LIS (Longest Increasing Subsequence) algorithm to return the indexes
     // that are not part of that subsequence.

runestone/hparsons/js/hparsonsFeedback.js

@@ -1,6 +1,7 @@
 export default class HParsonsFeedback {
     constructor(hparsons) {
         this.hparsons = hparsons;
+        this.percent = 0;
     }
     createOutput() {
         console.log('createOutput method not implemented in feedback!');