[Tools] No SessionID exists for CommentID when running tools/CouchDB_Import_Instruments.php

[laemtl]

PHP Fatal error: Uncaught NotFound: No SessionID exists for CommentID: `` in /var/www/html/loris/php/libraries/NDB_BVL_Instrument.class.inc:1460
Stack trace:
#0 /var/www/html/loris/php/libraries/NDB_BVL_Instrument.class.inc(971): NDB_BVL_Instrument->getSessionID()
#1 /var/www/html/loris/php/libraries/NDB_BVL_Instrument.class.inc(869): NDB_BVL_Instrument->_getExaminerNames()
#2 /var/www/html/loris/project/instruments/NDB_BVL_Instrument_aosi.class.inc(123): NDB_BVL_Instrument->_addMetadataFields()
#3 /var/www/html/loris/project/instruments/NDB_BVL_Instrument_aosi.class.inc(103): NDB_BVL_Instrument_aosi->_main()
#4 /var/www/html/loris/project/instruments/NDB_BVL_Instrument_aosi.class.inc(86): NDB_BVL_Instrument_aosi->_setupForm()
#5 /var/www/html/loris/php/libraries/NDB_BVL_Instrument.class.inc(255): NDB_BVL_Instrument_aosi->setup('', '')
#6 /var/www/html/loris/tools/CouchDB_Import_Instruments.php(196): NDB_BVL_Instrument::factory('aosi', '', '')
#7 /var/www/html/loris/tools/CouchDB_Import_Instruments.php(308): CouchDBInstrument in /var/www/html/loris/php/libraries/NDB_BVL_Instrument.class.inc on line 1460

Introduced by #5352