无科目时异常修正

ie-admin/src/main/java/com/ruoyi/web/service/LearnTeacherService.java

@@ -377,7 +377,7 @@ public class LearnTeacherService {
             Map<String, LearnDirectedKnowledge> directedKnowledgeMap = learnDirectedKnowledgeMapper.selectLearnDirectedKnowledgeList(dkCond).stream().collect(Collectors.toMap(LearnDirectedKnowledge::getDirectKey, t -> t));
             LearnDirectedKnowledge directedKnowledge = null;
             for(AMarjorPlan plan : planList) {
-                if(null != (directedKnowledge = getBestLearnDirectedKnowledge(plan, directedKnowledgeMap))) {
+                if(null != (directedKnowledge = getBestLearnDirectedKnowledge(plan, directedKnowledgeMap)) && StringUtils.isNotBlank(directedKnowledge.getSubjects())) {
                     subjectIdSet.addAll(Stream.of(directedKnowledge.getSubjects().split(",")).map(t -> Long.parseLong(t.trim())).collect(Collectors.toList()));
                 }
             }