get_lakehouse_columns returns no data when lakehouse has a schema

[aprenti67]

Describe the bug
df = lake.get_lakehouse_columns(lakehouse=lakehouse, workspace=workspace)
returns no data when the lakehouse has a schema

To Reproduce
Steps to reproduce the behavior:

1. execute the code passing the UUID for a lakehouse with a schema
2. display(df) results in "No Data Available"
3. execute the code passing the UUID for a lakehouse with NO schema
4. display(df) shows expected data

Expected behavior
results should be displayed for lakehouses with schemas