Worship Assistent import gives traceback

[Tomas Groth]

Importing from file attached here: http://support.openlp.org/scp/tickets.php?id=2570

Traceback (most recent call last):
  File "/home/tgc/OpenLP/openlp/trunk/openlp/core/ui/wizard.py", line 223, in on_current_id_changed
    self.perform_wizard()
  File "/home/tgc/OpenLP/openlp/trunk/openlp/plugins/songs/forms/songimportform.py", line 354, in perform_wizard
    importer.do_import()
  File "/home/tgc/OpenLP/openlp/trunk/openlp/plugins/songs/lib/importers/worshipassistant.py", line 121, in do_import
    self.parse_author(record['AUTHOR'])
  File "/home/tgc/OpenLP/openlp/trunk/openlp/plugins/songs/lib/importers/songimport.py", line 254, in parse_author
    for author in text.split(','):
AttributeError: 'NoneType' object has no attribute 'split'

Additionally there's an issue with importing verse orders, see: http://support.openlp.org/scp/tickets.php?id=2571