Issue Summary

Asset Import throws error, when an Object-Referenced-Attribute is marked as an Idenfitier, and the CSV file does not have any value for that attribute.

Steps to Reproduce

1. Create an import configuration with a few attributes of 'Object' type.
2. Make one of the object-referenced-attribute as one of the 'Identifier'.
3. Create a CSV file where this object-referenced-attribute value is empty.
4. Import the CSV file.

Expected Results

Throw error with the relevant details - such as 'attribute value cannot be empty (since its marked as 'Identifier')'.

Actual Results

• A duplicate object is created (since the Identifier condition failed).
• Import throws an error similar to the below screenshot.

Workaround

• Do not mark an object-referenced-attribute as an 'Identifier'. 
• Make sure to have a value for the object-referenced attribute if it's marked as an 'Identifier'