fix(result export): confidence set failed the campaign results export (…

…#176)

FIX confidence set related errors at results export

backend/api/views/annotation_campaign.py

@@ -186,7 +186,10 @@ def report(self, request, pk=None):
 
         for result in results:
             confidence_indicator_and_lvl_max = ""
-            if campaign.confidence_indicator_set is not None:
+            if (
+                campaign.confidence_indicator_set is not None
+                and result.confidence_indicator is not None
+            ):
                 max_level = campaign.confidence_indicator_set.max_level
                 confidence_indicator_and_lvl_max = (
                     f"{result.confidence_indicator.level}/{max_level}"
@@ -256,6 +259,8 @@ def report(self, request, pk=None):
                     "",
                     "",
                     "",
+                    "",
+                    "",
                     comment,
                 ]
             )