code: def _remove_empty_lines(self, lines):
          
  
          ret = []
          for l in lines:
              # Remove empty lines and lines with only one whitespace value
              if (len(l) > 1 or len(l) == 1 and
                      (not isinstance(l[0], str) or l[0].strip())):
                  ret.append(l)
          return ret
docs: Iterate through the lines and remove any that are
          either empty or contain only one whitespace value
  
          Parameters
          ----------
          lines : array-like
              The array of lines that we are to filter.
  
          Returns
          -------
          filtered_lines : array-like
              The same array of lines with the "empty" ones removed.