Virus visit column changes

I deployed the changes in prc-test but browsing https://prc-test.parkinson.lu/subjects raises an ajax error (414 uri too large). I don't get this error locally. I tried to increase the buffers in nginx but nothing makes it work.

This is not as a result of these changes. I tried to deploy a previous commit and got the same error.

@valentin.groues can you check prc-test machine and try to fix it? @piotr.gawron is this a known issue?

Changes:

• Change Visit 1 virus to Visit 0 RT-PCR
• Change Visit X virus to count from 0
• Filter for inconclusive
• Change rest of Visit number references in the table

smash/web/api_views/serialization_utils.py

@@ -19,6 +19,17 @@ def bool_to_yes_no_null(val):
         return "NO"
 
 
+def virus_test_to_str(test, date):
+    if test is None and date is not None:
+        return "Inconclusive"
+    if test is None:
+        return "N/A"
+    if test:
+        return "Positive"
+    else:
+        return "Negative"
+
+
 def flying_team_to_str(flying_team):
     result = ""
     if flying_team is not None: