misc: force labels to be text for json view (#35885)

bijoe/visualization/views.py

@@ -19,6 +19,7 @@ import hashlib
 import json
 
 from django.conf import settings
+from django.utils.encoding import force_text
 from django.utils.text import slugify
 from django.views.generic.edit import CreateView, DeleteView, UpdateView
 from django.views.generic.list import MultipleObjectMixin
@@ -301,7 +302,7 @@ class VisualizationJSONView(generics.GenericAPIView):
                 }
             elif len(drilldowns) == 1:
                 table = list(visualization.data())
-                axis_data = [(x[0]['value'] or '').strip() for x in table]
+                axis_data = [force_text(x[0]['value'] or '').strip() for x in table]
                 data = [x[1]['value'] for x in table]
                 if visualization.drilldown_x:
                     axis = {'x_labels': axis_data}