diff --git a/superset/db_engine_specs/__init__.py b/superset/db_engine_specs/__init__.py
index 377cf25935b1e..c5b47f153cd60 100644
--- a/superset/db_engine_specs/__init__.py
+++ b/superset/db_engine_specs/__init__.py
@@ -138,8 +138,7 @@ def get_available_engine_specs() -> Dict[Type[BaseEngineSpec], Set[str]]:
             backend = dialect.name
             if isinstance(backend, bytes):
                 backend = backend.decode()
-            if backend in backend_replacements:
-                backend = backend_replacements[backend]
+            backend = backend_replacements.get(backend, backend)
 
             driver = getattr(dialect, "driver", dialect.name)
             if isinstance(driver, bytes):
diff --git a/superset/models/slice.py b/superset/models/slice.py
index 9093cfa43acc7..b4c7f6604f9a0 100644
--- a/superset/models/slice.py
+++ b/superset/models/slice.py
@@ -53,7 +53,7 @@
 logger = logging.getLogger(__name__)
 
 
-class Slice(  # pylint: disable=too-many-public-methods, too-many-instance-attributes
+class Slice(  # pylint: disable=too-many-public-methods
     Model, AuditMixinNullable, ImportExportMixin
 ):
     """A slice is essentially a report or a view on data"""