message: AcceleratorBuffer::getExpectationValueZ() returns ROError-corrected value if ROErrorDecorator is used
diff: @@ -424,7 +424,9 @@ const double AcceleratorBuffer::getExpectationValueZ() {
  return 1;
  };
  - if (this->hasExtraInfoKey("exp-val-z")) {
  + if (this->hasExtraInfoKey("ro-fixed-exp-val-z")) {
  + aver = mpark::get<double>(getInformation("ro-fixed-exp-val-z"));
  + } else if (this->hasExtraInfoKey("exp-val-z")) {
  aver = mpark::get<double>(getInformation("exp-val-z"));
  } else {
  if (bitStringToCounts.empty()) {
  