Story SW-300: Fixing null values and implementing changes in the probe_mdb.py

.gitattributes

LCU/Maintenance/DBInterface/django_postgresql/settings.py

...ance/DBInterface/monitoringdb/models/hbacomponenterror.py

...ance/DBInterface/monitoringdb/models/lbacomponenterror.py

...e/DBInterface/monitoringdb/models/mongoengine/__init__.py

...Interface/monitoringdb/models/mongoengine/station_test.py

...ance/DBInterface/monitoringdb/models/rspcomponenterror.py

LCU/Maintenance/DBInterface/monitoringdb/models/rtsm.py

...ance/DBInterface/monitoringdb/models/tbbcomponenterror.py

...ce/DBInterface/monitoringdb/serializers/componenterror.py

...BInterface/monitoringdb/serializers/lbaerrorserializer.py

...nance/DBInterface/monitoringdb/serializers/mongoengine.py

...ce/DBInterface/monitoringdb/tests/t_nosqlconfiguration.py

LCU/Maintenance/DBInterface/monitoringdb/urls.py

LCU/Maintenance/MDB_tools/cli/probe_mdb.py

LCU/Maintenance/MDB_tools/requirements.txt