33487: Fix uninitialized structure StepVisual_FillAreaStyleColour for file with Unresoved Reference

[Rachvel]

Fix of reported bug: 33487

[luzpaz]

bump

[dpasukhi]

My apologies for delay.
The patch is not fully correct. It is not right behavior to check object to null withing object.

We will check solution and fix with more common fix.

[Rachvel]

Thank you for info.
I didn't had time to search the root of this exception. This workaround worked for us and I've reflected it in our local build.
At least you know that this situation can happened.