only show inbox statistics if inbox tags are defined

src-ui/src/app/components/dashboard/widgets/statistics-widget/statistics-widget.component.html

@@ -1,6 +1,6 @@
 <app-widget-frame title="Statistics" i18n-title>
   <ng-container content>
-    <p class="card-text" i18n>Documents in inbox: {{statistics.documents_inbox}}</p>
-    <p class="card-text" i18n>Total documents: {{statistics.documents_total}}</p>
+    <p class="card-text" i18n *ngIf="statistics?.documents_inbox != null">Documents in inbox: {{statistics?.documents_inbox}}</p>
+    <p class="card-text" i18n>Total documents: {{statistics?.documents_total}}</p>
   </ng-container>
 </app-widget-frame>

src/documents/tests/test_api.py

@@ -442,6 +442,13 @@ class TestDocumentApi(DirectoriesMixin, APITestCase):
         self.assertEqual(response.data['documents_total'], 3)
         self.assertEqual(response.data['documents_inbox'], 1)
 
+    def test_statistics_no_inbox_tag(self):
+        Document.objects.create(title="none1", checksum="A")
+
+        response = self.client.get("/api/statistics/")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.data['documents_inbox'], None)
+
     @mock.patch("documents.views.async_task")
     def test_upload(self, m):
 

src/documents/views.py

@@ -595,8 +595,14 @@ class StatisticsView(APIView):
     permission_classes = (IsAuthenticated,)
 
     def get(self, request, format=None):
-        return Response({
-            'documents_total': Document.objects.all().count(),
-            'documents_inbox': Document.objects.filter(
+        documents_total = Document.objects.all().count()
+        if Tag.objects.filter(is_inbox_tag=True).exists():
+            documents_inbox = Document.objects.filter(
                 tags__is_inbox_tag=True).distinct().count()
+        else:
+            documents_inbox = None
+
+        return Response({
+            'documents_total': documents_total,
+            'documents_inbox': documents_inbox,
         })