[MeL] VTK mesh conversion; Improve failure message

MeshLib/MeshGenerators/VtkMeshConverter.cpp

@@ -316,8 +316,10 @@ void VtkMeshConverter::convertArray(vtkDataArray& array,
         return;
     }
 
-    ERR("Array \"%s\" in VTU file uses unsupported data type.",
-        array.GetName());
+    WARN(
+        "Array '%s' in VTU file uses unsupported data type '%s'. The data "
+        "array will not be available.",
+        array.GetName(), array.GetDataTypeAsString());
     return;
 }