project field in HonoraryCertificate class blank=True

input/migrations/0026_auto_20201026_1214.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.1.1 on 2020-10-26 12:14
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('input', '0025_auto_20201026_1048'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='honorarycertificate',
+            name='project',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='input.project'),
+        ),
+    ]

input/models.py

@@ -66,14 +66,14 @@ class HonoraryCertificate(Intern):
     ''' this class is also used for accreditations '''
 
     # request_url = models.CharField(max_length=2000)
-    project = models.ForeignKey(Project, null = True, on_delete = models.SET_NULL)
+    project = models.ForeignKey(Project, null=True, blank=True, on_delete=models.SET_NULL)
 
     def __str__(self):
         return "Certificate for " + self.realname
 
 
 class Travel(Intern):
-    project = models.ForeignKey(Project, on_delete = models.CASCADE)
+    project = models.ForeignKey(Project, on_delete=models.CASCADE)