Remove nasty error message checking hack

from django.db.migrations.loader import AmbiguityError

from django.utils.datastructures import SortedDict

from django.utils.importlib import import_module

from django.utils.module_loading import module_has_submodule, import_by_path

class Command(BaseCommand):

        # Import the 'management' module within each installed app, to register

        # dispatcher events.

        for app_name in settings.INSTALLED_APPS:

            try:

            if module_has_submodule(import_module(app_name), "management"):

                import_module('.management', app_name)

            except ImportError as exc:

                # This is slightly hackish. We want to ignore ImportErrors

                # if the "management" module itself is missing -- but we don't

                # want to ignore the exception if the management module exists

                # but raises an ImportError for some reason. The only way we

                # can do this is to check the text of the exception. Note that

                # we're a bit broad in how we check the text, because different

                # Python implementations may not use the same text.

                # CPython uses the text "No module named management"

                # PyPy uses "No module named myproject.myapp.management"

                msg = exc.args[0]

                if not msg.startswith('No module named') or 'management' not in msg:

                    raise

        # Get the database we're operating from

        db = options.get('database')