Material editor: Custom node doesn't generate error in stats output

In 4.20 custom code material nodes no longer output their errors to the stats window.

1. Copy and paste the text into material editor
2. It generates a custom node with random incorrect code inside
3. Compile the material, no compile error stats appeared.

Expect: it should have error or warning stats if compile failed

It does has compile error in 4.18 and 4.19

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