git: openjdk/jfx-sandbox: metal: Fix NPE and Add TODO; NPE: tex could be null, it was null when ran Ensemble

[Ambarish Rapte]

Changeset: e4d455f2
Author:    Ambarish Rapte <arapte at openjdk.org>
Date:      2023-02-12 19:29:21 +0000
URL:       https://git.openjdk.org/jfx-sandbox/commit/e4d455f20104c416643d9549b3d87279711c3b9d

Fix NPE and Add TODO; NPE: tex could be null, it was null when ran Ensemble

Ensemble runs with this change, but is not usable, not interactable, shows many visual artifacts

! modules/javafx.graphics/src/main/java/com/sun/prism/mtl/MTLContext.java