OSB-28: removed error details serializer

.gitattributes

@@ -1818,7 +1818,6 @@ LCU/Maintenance/DBInterface/monitoringdb/serializers/component.py -text
 LCU/Maintenance/DBInterface/monitoringdb/serializers/component_error.py -text
 LCU/Maintenance/DBInterface/monitoringdb/serializers/element.py -text
 LCU/Maintenance/DBInterface/monitoringdb/serializers/element_error.py -text
-LCU/Maintenance/DBInterface/monitoringdb/serializers/error_details.py -text
 LCU/Maintenance/DBInterface/monitoringdb/serializers/rtsm.py -text
 LCU/Maintenance/DBInterface/monitoringdb/serializers/station.py -text
 LCU/Maintenance/DBInterface/monitoringdb/serializers/station_tests.py -text

LCU/Maintenance/DBInterface/monitoringdb/serializers/error_details.py

-from rest_framework.serializers import ModelSerializer
-from ..models.error_details import ErrorDetails
-
-class ErrorDetailsSerializer(ModelSerializer):
-    class Meta:
-        model = ErrorDetails
-        fields = '__all__'
-
-    def to_representation(self, instance):
-        result = super().to_representation(instance)
-
-        result = {key: value
-         for key, value in
-         filter(lambda item: item[1] is not None, result.items())}
-
-        return result
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