[Class statistics] Fix study track selection

services/frontend/src/components/FilterView/filters/studyTrack.jsx

@@ -7,7 +7,7 @@ import { Dropdown, Form } from 'semantic-ui-react'
 import { useLanguage } from '@/components/LanguagePicker/useLanguage'
 import { createFilter } from './createFilter'
 
-const StudyTrackFilterCard = ({ options, onOptionsChange, withoutSelf, activeAt, code }) => {
+const StudyTrackFilterCard = ({ activeAt, code, onOptionsChange, options, withoutSelf }) => {
   const { selected } = options
   const { getTextIn } = useLanguage()
 
@@ -72,7 +72,7 @@ export const studyTrackFilter = createFilter({
   defaultOptions: {
     selected: [],
   },
-  isActive: ({ selected }) => selected.length > 0,
+  isActive: ({ selected }) => (selected !== undefined ? selected.length > 0 : false),
   filter: (student, { selected, args }) => {
     const activeAt = _.get(args, 'activeAt', moment())
 

services/frontend/src/components/PopulationStatistics/index.jsx

@@ -151,7 +151,10 @@ export const PopulationStatistics = () => {
   const noStudentsMessage = () => (
     <div style={{ maxWidth: '80%' }}>
       <Message
-        content="Choose “Advanced settings” below and make sure you have the correct student groups included in the class. For example, if you are looking for students of a specialist training in medicine or dentistry, you must choose “Students with non-degree study right”."
+        content={`
+          Choose “Advanced settings” below and make sure you have the correct student groups included
+          in the class. For example, if you are looking for students of a specialist training in
+          medicine or dentistry, you must choose “Students with non-degree study right”.`}
         header="Not seeing any students?"
         icon="question"
         info
@@ -160,6 +163,8 @@ export const PopulationStatistics = () => {
     </div>
   )
 
+  const selected = query?.studyRights?.studyTrack ? [query?.studyRights?.studyTrack] : undefined
+
   return (
     <FilterView
       displayTray={location.search !== ''}
@@ -171,6 +176,9 @@ export const PopulationStatistics = () => {
         [hopsFilter.key]: {
           studyStart: (students[0] || {}).studyrightStart,
         },
+        [studyTrackFilter.key]: {
+          selected,
+        },
       }}
       name="PopulationStatistics"
       students={students}