Merge pull request #2916 from cisagov/rh/2883-update-agency

 #2883: Non Federal Agency Update - [RH]

src/registrar/admin.py

@@ -2473,7 +2473,10 @@ def generic_org_type(self, obj):
     generic_org_type.admin_order_field = "domain_info__generic_org_type"  # type: ignore
 
     def federal_agency(self, obj):
-        return obj.domain_info.federal_agency if obj.domain_info else None
+        if obj.domain_info:
+            return obj.domain_info.federal_agency
+        else:
+            return None
 
     federal_agency.admin_order_field = "domain_info__federal_agency"  # type: ignore
 

src/registrar/forms/domain.py

@@ -4,7 +4,7 @@
 from django import forms
 from django.core.validators import MinValueValidator, MaxValueValidator, RegexValidator, MaxLengthValidator
 from django.forms import formset_factory
-from registrar.models import DomainRequest
+from registrar.models import DomainRequest, FederalAgency
 from phonenumber_field.widgets import RegionalPhoneNumberWidget
 from registrar.models.suborganization import Suborganization
 from registrar.models.utility.domain_helper import DomainHelper
@@ -535,17 +535,25 @@ def __init__(self, *args, **kwargs):
 
     def save(self, commit=True):
         """Override the save() method of the BaseModelForm."""
+
         if self.has_changed():
 
             # This action should be blocked by the UI, as the text fields are readonly.
             # If they get past this point, we forbid it this way.
             # This could be malicious, so lets reserve information for the backend only.
-            if self.is_federal and not self._field_unchanged("federal_agency"):
-                raise ValueError("federal_agency cannot be modified when the generic_org_type is federal")
+
+            if self.is_federal:
+                if not self._field_unchanged("federal_agency"):
+                    raise ValueError("federal_agency cannot be modified when the generic_org_type is federal")
+
             elif self.is_tribal and not self._field_unchanged("organization_name"):
                 raise ValueError("organization_name cannot be modified when the generic_org_type is tribal")
 
-        super().save()
+            else:  # If this error that means Non-Federal Agency is missing
+                non_federal_agency_instance = FederalAgency.get_non_federal_agency()
+                self.instance.federal_agency = non_federal_agency_instance
+
+        return super().save(commit=commit)
 
     def _field_unchanged(self, field_name) -> bool:
         """