fix: 500 error message during opening program certificate

Error 500 occurs when going to the program certificate page if
an organization is connected to the Authoring organizations
field with an empty field Certificate logo image.

course_discovery/apps/course_metadata/forms.py

@@ -68,6 +68,21 @@ def clean(self):
 
         return self.cleaned_data
 
+    def clean_authoring_organizations(self):
+        authoring_organizations = self.cleaned_data.get('authoring_organizations')
+        orgs_with_empty_certificate_logo_image = []
+
+        for organization in authoring_organizations:
+            if not organization.certificate_logo_image:
+                orgs_with_empty_certificate_logo_image.append(organization.name)
+
+        if orgs_with_empty_certificate_logo_image:
+            error_message = f'Certificate logo image cannot be empty for organizations: ' \
+                            f'{", ".join(orgs_with_empty_certificate_logo_image)}.'
+            raise ValidationError(error_message)
+
+        return authoring_organizations
+
 
 class CourseRunSelectionForm(forms.ModelForm):
     class Meta:

course_discovery/apps/course_metadata/tests/test_forms.py

@@ -0,0 +1,72 @@
+from django.test import TestCase
+
+from course_discovery.apps.api.tests.mixins import SiteMixin
+from course_discovery.apps.core.tests.factories import USER_PASSWORD, UserFactory
+from course_discovery.apps.course_metadata.choices import ProgramStatus
+from course_discovery.apps.course_metadata.forms import ProgramAdminForm
+from course_discovery.apps.course_metadata.tests import factories
+
+
+class ProgramAdminFormTests(SiteMixin, TestCase):
+    """ Tests ProgramAdminForm. """
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.user = UserFactory(is_staff=True, is_superuser=True)
+        cls.course_runs = factories.CourseRunFactory.create_batch(3)
+        cls.courses = [course_run.course for course_run in cls.course_runs]
+        cls.product_source = factories.SourceFactory()
+
+        cls.excluded_course_run = factories.CourseRunFactory(course=cls.courses[0])
+        cls.program = factories.ProgramFactory(
+            courses=cls.courses,
+            excluded_course_runs=[cls.excluded_course_run],
+            partner=cls.partner,
+        )
+        cls.org_1 = factories.OrganizationFactory(certificate_logo_image=None)
+        cls.org_2 = factories.OrganizationFactory(certificate_logo_image=None)
+        cls.org_3 = factories.OrganizationFactory()
+
+    def setUp(self):
+        super().setUp()
+        self.client.login(username=self.user.username, password=USER_PASSWORD)
+
+    def _post_data(self, status=ProgramStatus.Unpublished, marketing_slug='/foo'):
+        return {
+            'title': 'some test title',
+            'courses': [self.courses[0].id],
+            'type': self.program.type.id,
+            'status': status,
+            'marketing_slug': marketing_slug,
+            'partner': self.program.partner.id,
+            'product_source': self.product_source.id,
+            'authoring_organizations': [self.org_1.id, self.org_2.id, self.org_3.id],
+        }
+
+    def test_clean_authoring_organizations_with_empty_certificate_logo_image(self):
+        """
+        Test verifies that the form is invalid if certificate_logo_image
+        is empty for any of the authoring_organizations.
+        """
+        data = self._post_data()
+        form = ProgramAdminForm(data=data)
+        self.assertFalse(form.is_valid())
+        expected_error_message = f'Certificate logo image cannot be empty for organizations: ' \
+                                 f'{self.org_1.name}, {self.org_2.name}.'
+
+        self.assertEqual(form.errors['authoring_organizations'][0], expected_error_message)
+
+    def test_clean_authoring_organizations_with_non_empty_certificate_logo_image(self):
+        """
+        Test verifies that the form is valid only if certificate_logo_image
+        is not empty for all authoring_organizations.
+        """
+        self.org_1.certificate_logo_image = 'logo1.jpg'
+        self.org_1.save()
+        self.org_2.certificate_logo_image = 'logo2.jpg'
+        self.org_2.save()
+        data = self._post_data()
+        form = ProgramAdminForm(data=data)
+
+        self.assertTrue(form.is_valid())