code: def count_empty(self, field):
          
          try:
              df2 = self.df[[field]]
              vals = where(df2.applymap(lambda x: x == ''))
              num = len(vals[0])
          except Exception as e:
              self.err(e, "Can not count empty values")
              return
          self.ok("Found", num, "empty rows in column " + field)
docs: List of empty row indices