Merge pull request #381 from Unity-Technologies/bugfix/fixing-mesh-collider-error-with-unity21.2

Bugfix/fixing mesh collider error with unity21.2

Author: lopezt-unity

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Bug Fixes
 
+- [case: 1323666] Preventing to assign an empty mesh as MeshCollider.
 - [case: 1322032] Fixing wrong ProBuilderMesh colors on domain reload when null.
 - [case: 1322150] Fixing torus and sphere UV generation when creating New Shape.
 - [case: 1320936] Fixing 'ProBuilderize' action creating empty submeshes.

Runtime/Core/ProBuilderMeshFunction.cs

@@ -425,8 +425,7 @@ internal void EnsureMeshColliderIsAssigned()
 #if ENABLE_DRIVEN_PROPERTIES
                 SerializationUtility.RegisterDrivenProperty(this, collider, "m_Mesh");
 #endif
-
-                collider.sharedMesh = mesh;
+                collider.sharedMesh = (mesh != null && mesh.vertexCount > 0) ? mesh : null;
             }
         }