removed default namespace

plugins/org.yakindu.sct.model.sgraph/src/org/yakindu/sct/model/sgraph/naming/SGraphNameProvider.java

@@ -48,7 +48,7 @@ public class SGraphNameProvider extends DefaultDeclarativeQualifiedNameProvider
 			name = nameConverter.toQualifiedName(nameString);
 		} else if (nameString == null) {
 			// Default interface
-			name = nameConverter.toQualifiedName("default");
+			name = nameConverter.toQualifiedName("");
 		}
 
 		QualifiedName namespace = getNamespace(ele);

plugins/org.yakindu.sct.model.stext/src/org/yakindu/sct/model/stext/naming/StextNameProvider.java

@@ -20,7 +20,7 @@ public class StextNameProvider extends SGraphNameProvider {
 			name = nameConverter.toQualifiedName(ele.getName());
 		} else if (ele.getName() == null) {
 			// Default interface
-			name = nameConverter.toQualifiedName("default");
+			name = nameConverter.toQualifiedName("");
 		}
 
 		QualifiedName namespace = getNamespace(ele);