Blueprint inherited from StaticMeshActor will fail to compile if StaticMesh is NULL

1. Create a Blueprint inheriting from StaticMeshActor class.
2. Compile the Blueprint.

It will log the error as following, and 4.20 does not have this issue.

"It is common that the staticmesh will be set at runtime in game", the licensee said, so it is necessary to be fixed for them.

UMG RichText not appear image when packaged

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In UE5.4, custom variables in the level blueprint cannot be set to default values, and the eyedropper tool is also unavailable, whereas in UE4.27, these features work normally.