Material containing null expressions crashes when launching the editor with the -Game flag

This comes from a UDN report.
[Link Removed]

When launching the editor with -game, if a material contains a null expression (for instance because that material expression has been removed), the binary will crash, as GIsEditor is false, so null expressions won't take place in UMaterial::PostLoad().

We need to make sure the array of expressions is always cleaned up even when GIsEditor is false.

This occurs when launching the editor in game mode with the -game flag, and the launched level contains a material with an expression whose type was deleted.

[UE-23848] Bug Status

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