#334 Post-Python 3: Secondary verification filer mishandles invalid reference IDs

[Ahasuerus]

Secondary verification filer mishandles invalid reference IDs. Expected values should follow the "xxNN" format, where 'xx' is 2 actual letters 'x' and 'NN' stands for two integer numbers. The Python code extracts int(name[2:]) without checking whether the extracted value is an integer, which causes a Python error if it's not.