elective report compatible for non-finish processing

src/views/career/bigdataSelectCourse/enrollReport.vue

@@ -113,7 +113,7 @@ export default {
           nextName,
           nextRecommend
         }
-      })
+      }).filter(m => !!m) // filter null element.
       const enrollIndex = steps.findIndex(step => step?.isEnroll)
       return steps.slice(0, enrollIndex + 1)
     }