Don't show num assessments info for practice quiz selection.

Ensure we don't show any topics without children, even if the unfiltered num assessments says otherwise.

kolibri/plugins/coach/assets/src/composables/useQuizResources.js

@@ -67,6 +67,13 @@ export default function useQuizResources({ topicId, practiceQuiz = false } = {})
                   // return null so we can easily filter after
                   return null;
                 }
+                if (node.kind === ContentNodeKinds.TOPIC && !node.children) {
+                  // If the topic has no children, we can assume it has no assessments
+                  // Only do this check for topics, because CHANNEL kinds are normally
+                  // ChannelMetadata objects masquerading as ContentNode objects
+                  // and so don't have children
+                  return null;
+                }
                 node.num_assessments = topicsWithAssessmentCountsMap[node.id];
               }
               return node;

kolibri/plugins/coach/assets/src/views/plan/CreateExamPage/ResourceSelection.vue

@@ -730,7 +730,7 @@
     },
     methods: {
       cardNoticeContent(content) {
-        if (content.kind === ContentNodeKinds.EXERCISE) {
+        if (!this.selectPracticeQuiz && content.kind === ContentNodeKinds.EXERCISE) {
           return this.questionsUnusedInSection$({
             count: this.unusedQuestionsCount(content),
           });