fix(notebooks): handle no bucket selected (#3252)

Author: Gene Hynson

src/flows/pipes/QueryBuilder/readOnly.tsx

@@ -37,7 +37,9 @@ const QueryBuilder: FC<PipeProp> = ({Context}) => {
                         icon={IconFont.BucketSolid}
                         status={ComponentStatus.Disabled}
                       >
-                        {data.buckets[0].name ?? 'No Bucket Selected'}
+                        {!!data?.buckets?.length && data?.buckets?.[0]?.name
+                          ? data.buckets[0].name
+                          : 'No Bucket Selected'}
                       </Dropdown.Button>
                     )}
                     menu={onCollapse => (