Waffle plot errors on dashboard

[mbarton]

Generate an example CSV following the example commands from the generator README:

docker compose exec django python manage.py create_csv \
        --pts=5 \
        --visits="CDCD DHPC ACDC CDCD" \
        --hb_target=T \
        --age_range=11_15
        --build

docker compose exec django python manage.py create_csv --coalesce

File attached for convenience: coalesced_20250108152244.csv

Upload that CSV and then view the dashboard. You get an error calculating the cards with waffle plots:

django-1   | INFO [django.server] "GET /get_waffle_chart_partial?T2DM=20&Other%20rare%20forms=80 HTTP/1.1" 200 120                                            
django-1   | WARNING [project.npda.views.decorators:23] User SuperuserAda  has bypassed 2FA for <function get_simple_bar_chart_pcts_partial at 0x71dcb4cee660>
 as settings.DEBUG is True                                                                                                                                    
django-1   | WARNING [project.npda.views.decorators:23] User SuperuserAda  has bypassed 2FA for <function get_waffle_chart_partial at 0x71dcb4cee0c0> as setti
ngs.DEBUG is True                                                                                                                                             
django-1   | ERROR [project.npda.views.dashboard.partials:258] Error generating waffle chart                                                                  
django-1   | Traceback (most recent call last):                                                                                                               
django-1   |   File "/app/project/npda/views/dashboard/partials.py", line 178, in get_waffle_chart_partial                                                    
django-1   |     for idx, (label, num_squares) in enumerate(data):                                                                                            
django-1   |              ^^^^^^^^^^^^^^^^^^^^                                                                                                                
django-1   | ValueError: too many values to unpack (expected 2)