Monkey-patch Django mysql schema to skip setting default value when altering BLOB/TEXT fields

schema.py

from django.db.backends.mysql import schema

class DatabaseSchemaEditor(schema.DatabaseSchemaEditor):
    @property
    def _supports_limited_data_type_defaults(self):
        # MariaDB >= 10.2.1 supports defaults for BLOB and TEXT.
        if self.connection.mysql_is_mariadb:
            return self.connection.mysql_version >= (10, 2, 1)
        return False

schema.DatabaseSchemaEditor = DatabaseSchemaEditor