Check the uniqueness of resource IDs; minor changes to metadata config reader.
Check the uniqueness of resource IDs; minor changes to metadata config reader.

NLeSC/ODEX-FAIRDataPoint,NLeSC/ODEX-FAIRDataPoint,DTL-FAIRData/ODEX-FAIRDataPoint,DTL-FAIRData/ODEX-FAIRDataPoint,NLeSC/ODEX-FAIRDataPoint,DTL-FAIRData/ODEX-FAIRDataPoint,NLeSC/ODEX-FAIRDataPoint,DTL-FAIRData/ODEX-FAIRDataPoint