[dagster-databricks] Fix Cluster Drive Log Root Error when no extras …

…provided for pipe (#26592)

## Summary & Motivation
Addresses bug #26434 where an error is thrown for any Databricks Pipes
where extras have not been provided for the pipe.

Update checks if extras is available in params first to prevent the bug
from being thrown

## How I Tested These Changes

## Changelog

> Insert changelog entry or delete this section.

python_modules/libraries/dagster-databricks/dagster_databricks/pipes.py

@@ -475,7 +475,9 @@ def name(self) -> str:
     # job has finished.
     def _get_log_path(self, params: PipesParams) -> Optional[str]:
         if self.log_path is None:
-            cluster_driver_log_root = params["extras"].get("cluster_driver_log_root")
+            cluster_driver_log_root = (
+                params["extras"].get("cluster_driver_log_root") if "extras" in params else None
+            )
             if cluster_driver_log_root is None:
                 return None
             try: