Fixed #25855 -- Enhanced the migration warning for runserver.

        plan = executor.migration_plan(executor.loader.graph.leaf_nodes())

        if plan:

            self.stdout.write(self.style.NOTICE(

                "\nYou have unapplied migrations; your app may not work properly until they are applied."

            ))

            apps_waiting_migration = sorted(set(migration.app_label for migration, backwards in plan))

            self.stdout.write(

                self.style.NOTICE(

                    "\nYou have %(unpplied_migration_count)s unapplied migration(s). "

                    "Your project may not work properly until you apply the "

                    "migrations for app(s): %(apps_waiting_migration)s." % {

                        "unpplied_migration_count": len(plan),

                        "apps_waiting_migration": ", ".join(apps_waiting_migration),

                    }

                )

            )

            self.stdout.write(self.style.NOTICE("Run 'python manage.py migrate' to apply them.\n"))

# Kept for backward compatibility

from __future__ import unicode_literals

from django.db import migrations, models

class Migration(migrations.Migration):

    initial = True

    dependencies = [

    ]

    operations = [

        migrations.CreateModel(

            name='Foo',

            fields=[

                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),

                ('name', models.CharField(max_length=255)),

            ],

        ),

    ]

from __future__ import unicode_literals

from django.db import models

class Foo(models.Model):

    name = models.CharField(max_length=255)

    class Meta:

        app_label = 'another_app_waiting_migration'