Return a list of base-wise error observations for the query 

    :returns: list of base-wise errors
    :rtype: list of HPA groups

def get_query_errors(self):
    """ Return a list of base-wise error observations for the query 

    :returns: list of base-wise errors
    :rtype: list of HPA groups

    """
    if self._query_errors: return self._query_errors
    v = []
    for i in range(len(self._query_hpas)):
      v.append(self.get_query_error(i))
    return v