Addressed integration test issue (#839)

Fixed and issue introduced with PR #825

Author: FastLee

src/databricks/labs/ucx/assessment/clusters.py

@@ -4,6 +4,7 @@
 
 from databricks.sdk import WorkspaceClient
 from databricks.sdk.errors import NotFound
+from databricks.sdk.service import compute
 from databricks.sdk.service.compute import ClusterDetails, ClusterSource, Policy
 
 from databricks.labs.ucx.assessment.crawlers import (
@@ -67,17 +68,21 @@ def _check_init_scripts(self, cluster, failures):
                 continue
             failures.append(f"{_AZURE_SP_CONF_FAILURE_MSG} cluster.")
 
-    def _check_cluster_failures(self, cluster: ClusterDetails):
+    def _check_cluster_failures(self, cluster: ClusterDetails | compute.ClusterSpec):
         failures = []
-        if not cluster.creator_user_name:
+        if isinstance(cluster, ClusterDetails) and not cluster.creator_user_name:
             logger.warning(
                 f"Cluster {cluster.cluster_id} have Unknown creator, it means that the original creator "
                 f"has been deleted and should be re-created"
             )
+        cluster_id = cluster.cluster_id if isinstance(cluster, ClusterDetails) and cluster.cluster_id else ""
+        creator_user_name = (
+            cluster.creator_user_name if isinstance(cluster, ClusterDetails) and cluster.creator_user_name else None
+        )
         cluster_info = ClusterInfo(
-            cluster_id=cluster.cluster_id if cluster.cluster_id else "",
+            cluster_id=cluster_id,
             cluster_name=cluster.cluster_name,
-            creator=cluster.creator_user_name,
+            creator=creator_user_name,
             success=1,
             failures="[]",
         )