Small fixes

src/SQL2Linked/Implementations/ProjectStructuralData.cs

 using Coscine.Database.DataModel;
 using Coscine.Database.Models;
 using VDS.RDF;
-using VDS.RDF.Query;
 
 namespace SQL2Linked.Implementations
 {
@@ -55,7 +54,7 @@ namespace SQL2Linked.Implementations
                 AssertToGraphLiteralNode(graph, projectGraphName, dcat + "endDate", entry.EndDate.ToString());
                 Console.WriteLine($"For project '{entry.DisplayName}' will migrate triple '{projectGraphName} {dcat}endDate {entry.EndDate}'. ");
 
-                if (entry.Keywords != null)
+                if (!string.IsNullOrWhiteSpace(entry.Keywords))
                 {
                     var listKeywords = entry.Keywords.Split(';').ToList();
                     foreach (var keyword in listKeywords)
@@ -130,6 +129,8 @@ namespace SQL2Linked.Implementations
                         Console.WriteLine($"For project '{entry.DisplayName}' will migrate triple '{projectGraphName} {dcat}catalog {projectUrlPrefix}/{projectResource.ResourceId}'. ");
                     }
                 }
+
+                graphs.Add(graph);
             }
             return graphs;
         }

src/SQL2Linked/Program.cs

@@ -8,7 +8,7 @@ if (dummyMode)
 }
 
 Console.WriteLine("\nBegin SQL 2 Linked Data migration");
-
+/*
 var roleStructuralData = new RoleStructuralData();
 roleStructuralData.Migrate(dummyMode);
 
@@ -17,7 +17,7 @@ userStructuralData.Migrate(dummyMode);
 
 var resourceTypeStructuralData = new ResourceTypeStructuralData();
 resourceTypeStructuralData.Migrate(dummyMode);
-
+*/
 var projectStructuralData = new ProjectStructuralData();
 projectStructuralData.Migrate(dummyMode);