HHH-14519 More informative error message for bad logical column name

[karge-itestra]

When a logical column name identifier cannot be created, there is only an error message that the "column name must not be null". In the case I experienced, the column name was in fact empty and not null, but the column identifier could not be found. This changes the error message to make the cause more clear and also give information about the context (table name, column name given)