Update: Remove old metadata structure traces

src/Blob/Controllers/BlobController.cs

@@ -36,7 +36,6 @@ namespace Coscine.Api.Blob.Controllers
         private readonly AnalyticsLogObject _analyticsLogObject;
         private readonly RdfStoreConnector _rdfStoreConnector;
         private readonly CoscineLDPHelper _coscineLDPHelper;
-        private readonly string _prefix;
 
         /// <summary>
         /// Blob controller constructor
@@ -53,8 +52,7 @@ namespace Coscine.Api.Blob.Controllers
 
             _coscineLogger = new CoscineLogger(logger);
             _analyticsLogObject = new AnalyticsLogObject();
-            _prefix = _configuration.GetStringAndWait("coscine/global/epic/prefix");
-            _coscineLDPHelper = new CoscineLDPHelper(_rdfStoreConnector, _prefix);
+            _coscineLDPHelper = new CoscineLDPHelper(_rdfStoreConnector);
         }
 
         /// <summary>