Handle edge case when node capacity is undefined gracefully. Closes #7280. (kubeflow/kubeflow#7281)

* Handle edge case when node capacity is undefined gracefully

* Change log message to capacity

* No need to make the message a warning

* Resolve flake8 issue

* ensure closing bracket matches indentation of opening bracket

* Fix flake8 issues from other files

components/crud-web-apps/jupyter/backend/apps/common/routes/get.py

@@ -114,7 +114,12 @@ def get_gpu_vendors():
     installed_resources = set()
     nodes = api.list_nodes().items
     for node in nodes:
-        installed_resources.update(node.status.capacity.keys())
+        if node.status.capacity:
+            installed_resources.update(status.capacity.keys())
+        else:
+            log.debug(
+                "Capacity was not available for node {node.metadata.name}"
+            )
 
     # Keep the vendors the key of which exists in at least one node
     available_vendors = installed_resources.intersection(config_vendor_keys)