docs: def get_query_error(self,i):
      """Just get a single error characterization based on the index
  
      :param i: list index
      :type i: int
      :returns: base-wise error
      :rtype: HPA group description
  
  
      """
      x = self._query_hpas[i]
      h = x['hpa']
      pos = x['pos']
      prob = 0
      be = BaseError('query')
      be.set_observable(h.get_target(),h.get_query())
      if i != 0 and pos == 0: # check for a total deletion before
        prev = x['prev-hpa']
        if len(prev.get_query()) == 0: # total deletion
          be.set_unobserved_before(len(prev.get_target()),0,prev.get_target()[0],0.5)
      if i != len(self._query_hpas)-1 and pos == len(h.get_query())-1: # check for a total deletion before
        if x['next-hpa']:
          foll = x['next-hpa']
          if len(foll.get_query()) == 0: # total deletion
            be.set_unobserved_after(len(foll.get_target()),0,foll.get_target()[0],0.5)
      return be