Refs #33817 -- Corrected errors raised when Oracle driver is not installed.

oracledb_any should reraise ImportError instead of raising
ImproperlyConfigured.

django/db/backends/oracle/base.py

@@ -14,13 +14,17 @@ from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.db import IntegrityError
 from django.db.backends.base.base import BaseDatabaseWrapper
-from django.db.backends.oracle.oracledb_any import oracledb as Database
 from django.db.backends.utils import debug_transaction
 from django.utils.asyncio import async_unsafe
 from django.utils.encoding import force_bytes, force_str
 from django.utils.functional import cached_property
 from django.utils.version import get_version_tuple
 
+try:
+    from django.db.backends.oracle.oracledb_any import oracledb as Database
+except ImportError as e:
+    raise ImproperlyConfigured(f"Error loading oracledb module: {e}")
+
 
 def _setup_environment(environ):
     # Cygwin requires some special voodoo to set the environment variables

django/db/backends/oracle/oracledb_any.py

@@ -1,6 +1,5 @@
 import warnings
 
-from django.core.exceptions import ImproperlyConfigured
 from django.utils.deprecation import RemovedInDjango60Warning
 
 try:
@@ -18,4 +17,4 @@ except ImportError as e:
         )
         is_oracledb = False
     except ImportError:
-        raise ImproperlyConfigured(f"Error loading oracledb module: {e}")
+        raise e from None