[Rendering] Minor bugfix with skinned/mesh render system;

Author: LittleCodingFox

Engine/Core/Rendering/Animation/SkinnedMeshRenderSystem.cs

@@ -75,14 +75,23 @@ public void Process((Entity, Transform, IComponent)[] entities, Camera activeCam
                 continue;
             }
 
+            var skip = false;
+
             for (var i = 0; i < renderer.materials.Count; i++)
             {
-                if (renderer.materials[i]?.IsValid == false)
+                if ((renderer.materials[i]?.IsValid ?? false) == false)
                 {
-                    continue;
+                    skip = true;
+
+                    break;
                 }
             }
 
+            if(skip)
+            {
+                continue;
+            }
+
             renderer.animator ??= new(entity, EntityQueryMode.Parent, false);
 
             renderers.Add(new()

Engine/Core/Rendering/Mesh/MeshRenderSystem.cs

@@ -169,14 +169,23 @@ public void Process((Entity, Transform, IComponent)[] entities, Camera activeCam
                 continue;
             }
 
+            var skip = false;
+
             for (var i = 0; i < r.materials.Count; i++)
             {
-                if (r.materials[i]?.IsValid == false)
+                if ((r.materials[i]?.IsValid ?? false) == false)
                 {
-                    continue;
+                    skip = true;
+
+                    break;
                 }
             }
 
+            if(skip)
+            {
+                continue;
+            }
+
             if (r.mesh.submeshes.Count > 0 && r.materials.Count != r.mesh.submeshes.Count)
             {
                 continue;