message: Fix warning C4706
diff: @@ -3034,12 +3034,20 @@ class parser
  {
  case token_type::begin_object:
  {
  - if (keep and (not callback or ((keep = callback(depth++, parse_event_t::object_start, result)))))
  + if (keep)
  + {
  + if (callback)
  + {
  + keep = callback(depth++, parse_event_t::object_start, result);
  + }
  +
  + if (not callback or keep)
  {
  // explicitly set result to object to cope with {}
  result.m_type = value_t::object;
  result.m_value = value_t::object;
  }
  + }
  // read next token
  get_token();
  @@ -3130,12 +3138,20 @@ class parser
  case token_type::begin_array:
  {
  - if (keep and (not callback or ((keep = callback(depth++, parse_event_t::array_start, result)))))
  + if (keep)
  + {
  + if (callback)
  + {
  + keep = callback(depth++, parse_event_t::array_start, result);
  + }
  +
  + if (not callback or keep)
  {
  // explicitly set result to object to cope with []
  result.m_type = value_t::array;
  result.m_value = value_t::array;
  }
  + }
  // read next token
  get_token();
  