Don't allow null values for qualifiers

vulnerabilities/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 3.0.7 on 2021-01-11 17:14
+# Generated by Django 3.0.7 on 2021-01-21 16:32
 
 import django.contrib.postgres.fields.jsonb
 from django.db import migrations, models
@@ -40,7 +40,7 @@ class Migration(migrations.Migration):
                 ('name', models.CharField(blank=True, help_text='Name of the package.', max_length=100)),
                 ('version', models.CharField(blank=True, help_text='Version of the package.', max_length=100)),
                 ('subpath', models.CharField(blank=True, help_text='Extra subpath within a package, relative to the package root.', max_length=200)),
-                ('qualifiers', django.contrib.postgres.fields.jsonb.JSONField(default=dict, help_text='Extra qualifying data for a package such as the name of an OS, architecture, distro, etc.', null=True)),
+                ('qualifiers', django.contrib.postgres.fields.jsonb.JSONField(default=dict, help_text='Extra qualifying data for a package such as the name of an OS, architecture, distro, etc.')),
             ],
         ),
         migrations.CreateModel(

vulnerabilities/models.py

@@ -114,7 +114,7 @@ class Meta:
             "Extra qualifying data for a package such as the name of an OS, "
             "architecture, distro, etc."
         ),
-        null=True,
+        null=False,
     )
 
     def set_package_url(self, package_url):