Some tables are missing priority column

[ogroleg]

So that we don't parse them correctly.
Example: http://vstup.info/2017/605/i2017i605p384619.html

Traceback (most recent call last):
File "/home/oleg/vstup/ispyt/data_parser/vstup2017.py", line 148, in
start_parsing_pages_and_write_result_to_database(args)
File "/home/oleg/vstup/ispyt/data_parser/vstup2017.py", line 141, in start_parsing_pages_and_write_result_to_database
(file_cache, is_all_files_read, input_arguments)] * input_arguments.workers) # and process queue using pool
File "/usr/lib/python3.6/multiprocessing/pool.py", line 274, in starmap
return self._map_async(func, iterable, starmapstar, chunksize).get()
File "/usr/lib/python3.6/multiprocessing/pool.py", line 644, in get
raise self._value
AttributeError: 'NoneType' object has no attribute 'strip'