[Django] #24332: Sites migration fails when DATABASES['default'] = {}

[Django]

#24332: Sites migration fails when DATABASES['default'] = {}
----------------------------+----------------------------------
     Reporter:  trecouvr    |      Owner:  nobody
         Type:  Bug         |     Status:  new
    Component:  Migrations  |    Version:  1.7
     Severity:  Normal      |   Keywords:  migrate post_migrate
 Triage Stage:  Unreviewed  |  Has patch:  0
Easy pickings:  0           |      UI/UX:  0
----------------------------+----------------------------------
 On Django 1.7.4 the management command `migrate --database=xxx` fails when
 `DATABASES['default'] = {}` with
 `django.core.exceptions.ImproperlyConfigured: settings.DATABASES is
 improperly configured. Please supply the ENGINE value. Check settings
 documentation for more details.`.
 On Django 1.7.3 it works fine.
 More details can be found on https://code.djangoproject.com/ticket/24298.

 To reproduce the problem:

 1. Create a new project
 2. Edit the settings.py this way:


 {{{
 DATABASES = {
     'default': {},
     'mysite': {
         'ENGINE': 'django.db.backends.sqlite3',
         'NAME': os.path.join(BASE_DIR, 'db_mysite.sqlite3'),
     }
 }
 }}}

 3. Run python manage.py migrate --database=mysite

 Problem:
 It seems Django tries to access the default connection.


 I am attaching an output log of the command.
 Here is a sample project to reproduce the behaviour:
 ​https://github.com/trecouvr/test_dj_migrate_174.

--
Ticket URL: <https://code.djangoproject.com/ticket/24332>
Django <https://code.djangoproject.com/>
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