fix: don't create examples db on 'superset init' (#9881)

* chore: don't create examples db on 'superset init'

* fix isort

superset/errors.py

@@ -15,11 +15,10 @@
 # specific language governing permissions and limitations
 # under the License.
 # pylint: disable=too-few-public-methods,invalid-name
+from dataclasses import dataclass
 from enum import Enum
 from typing import Any, Dict, Optional
 
-from dataclasses import dataclass
-
 
 class SupersetErrorType(str, Enum):
     """