Some checks and fixes in LabContacts import routine
Some checks and fixes in LabContacts import routine

Traceback (innermost last):
  Module ZPublisher.Publish, line 138, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 48, in call_object
  Module bika.lims.exportimport.dataimport, line 76, in __call__
  Module bika.lims.exportimport.load_setup_data, line 99, in __call__
  Module bika.lims.exportimport.setupdata, line 83, in __call__
  Module bika.lims.exportimport.setupdata, line 402, in Import
  Module <string>, line 10, in addMember
  Module plone.protect.utils, line 46, in _curried
  Module <string>, line 10, in addMember
  Module AccessControl.requestmethod, line 70, in _curried
  Module Products.CMFCore.RegistrationTool, line 143, in addMember
ValueError: The login name you selected is already in use or is not valid. Please choose another.

labsanmartin/Bika-LIMS,veroc/Bika-LIMS,labsanmartin/Bika-LIMS,rockfruit/bika.lims,labsanmartin/Bika-LIMS,veroc/Bika-LIMS,veroc/Bika-LIMS,rockfruit/bika.lims