After enabling the View | Options | Data Grids | Visual | "display {null} for Null columns" the Schema Browser does not display {null} for columns that are Foreign keys and are Null.
WORKAROUND:
Run the query in the SQL Editor.
STATUS:
This issue was fixed in Toad for Oracle 8.6. The latest version of Toad for Oracle can be downloaded at:https://support.quest.com/download-product-select
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