fix collection not found

[atmonshi]

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[what-the-diff]

PR Summary

• Improvement in "FieldsContract.php"
  The way we fetch data from a collection in the "FieldsContract.php" has been enhanced. This change allows us to more safely retrieve values based on a certain 'dataSource' option of a field. It employs a process called null-safe operator to ensure we avoid unnecessary errors when the collection might be unavailable or empty.