Add additional check to check material library is loaded when trying to retrieve names (#6165)

* Add additional check to ensure material library is loaded when trying to retrieve names.

Signed-off-by: Danilo Aimini <82231674+AMZN-daimini@users.noreply.github.com>

* Mark physmaterial assets as critical

Signed-off-by: Danilo Aimini <82231674+AMZN-daimini@users.noreply.github.com>

Co-authored-by: Danilo Aimini <82231674+AMZN-daimini@users.noreply.github.com>

Signed-off-by: moraaar moraaar@amazon.com

Gems/PhysX/Code/Source/Pipeline/MeshGroup.cpp

@@ -864,7 +864,8 @@ namespace PhysX
         {
             if (auto* physicsSystem = AZ::Interface<AzPhysics::SystemInterface>::Get())
             {
-                if (const auto* physicsConfiguration = physicsSystem->GetConfiguration())
+                if (const auto* physicsConfiguration = physicsSystem->GetConfiguration();
+                    physicsConfiguration && physicsConfiguration->m_materialLibraryAsset)
                 {
                     const auto& materials = physicsConfiguration->m_materialLibraryAsset->GetMaterialsData();
 

Registry/AssetProcessorPlatformConfig.setreg

@@ -442,6 +442,7 @@
                 "RC physmaterial": {
                     "glob": "*.physmaterial",
                     "params": "copy",
+                    "critical": "true",
                     "productAssetType": "{9E366D8C-33BB-4825-9A1F-FA3ADBE11D0F}"
                 },
                 "RC ocm": {