Issue with reading Voltage source converter data from PSSE RAW file

[jahanbani]

when reading PSSE RAW file version 33 using parse_file, the following error is thrown:
ERROR: KeyError: key "CONVERTER BUSES" not found
Below is an example of the VSC data that generates this error (taken from a PSSE dataset which can be successfully imported to PSSE):

0 / END OF TWO-TERMINAL DC DATA, BEGIN VSC DC LINE DATA
"CSC-VSC ",1, 1.5800, 99,1.0000
1001,2,1, 0.00, 1.02000, 1600.000, 3.400, 1110.000, 360.00, 1032.00,0.50000, -20.00, -70.00, 0, 100.0
1002,1,1, 300.00, 1.02080, 1600.000, 3.400, 1110.000, 360.00, 1085.00,0.50000, -11.00, -70.00,1003, 100.0
0 / END OF VSC DC LINE DATA, BEGIN IMPEDANCE CORRECTION DATA