Fix error when retrieving the name of the analyst from refanalyses

  Module bika.lims.browser.bika_listing, line 711, in contents_table
  Module bika.lims.browser.bika_listing, line 776, in __init__
  Module bika.lims.browser.worksheet, line 381, in folderitems
  Module bika.lims.browser.analyses, line 554, in folderitems
AttributeError: getAnalystName