try{}catch{} not catching Mesh.vertices is too small.

I have error showing up in the console

Mesh.vertices is too small. The supplied vertex array has less vertices than are referenced by the triangles array. UnityEngine.Mesh:set_vertices(Vector3[])

I would like get some more information about it but I can not catch this exception. try{ mesh.vertices = newVerts; mesh.triangles = newTris; mesh.uv = newUVs; }

         catch(UnityException){
             Debug.Log ("vert error: "+ name);
             throw; 
         }
         catch {
             Debug.Log ("vert error: "+ name);
             throw; 
         }

I can write my own code to check explicitly for the exception, but I would like to understand how to catch exceptions generated by Unity.