makemigrations doesn't generate any output for a model with CharField blank=False

[Mikalai Radchuk]

It looks makemigrations is unable to generate migrations for a model that contains CharField with blank=False or with default value (which is blank=False).

I did manage to replicate it on Django 1.9, 1.10, 1.10.8, 1.11, 1.11.4, 1.11.5.

The issue can be reproduced using the following steps:

1. Create an app with models.py like this one:

from django.db import models


class ExternalResourcePage(models.Model):
    # authors = models.CharField(max_length=256)
    publication_date = models.DateField()
    show_on_website = models.BooleanField(default=True)

2. Run the makemigrations command. It will generate an initial migration file.
3. Uncomment the authors field.
4. Run the makemigrations command again. It will not generate a new migration file and will not give you any output. Exit code is 0.

makemigrations works fine with authors = models.CharField(max_length=256, blank=True)

Expected result: makemigrations creates a migration file or fails with a traceback in case of any exceptions.