avoid :key on template with vue2, fixes #242

js/test-block.js

@@ -27,8 +27,8 @@ const CoursewareTestBlock = {
                         {{assignment.title}}
                     </span>
                 </div>
-                <template v-for="(exercise, index) in exercises" :key="exercise.id">
-                    <div v-show="index === exercise_pos">
+                <template v-for="(exercise, index) in exercises">
+                    <div v-show="index === exercise_pos" :key="exercise.id">
                         <form class="default" autocomplete="off" :exercise="exercise.id">
                             <fieldset class="cw-exercise-fieldset" v-html="exercise.template" ref="content">
                             </fieldset>