Assert triggering when trying to copy-paste an empty CurveAtlasRowParameter node in the material editor

A check happens when copy/pasting a Curve Atlas Row Parameter Expression that has no value.

This behavior also exists on CL 32426910 of Release-5.4.

1. Download the attached test project and open.
2. Open the material "M_Crashy"
3. Select and copy the Curve Atlas Row Parameter Expression "Param_Crashy"
4. Paste the copied expression
5. Observe the check.

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