only apply concrete node offset if its present and its set

Author: robincornelius

EDSTest/DevicePDOView.cs

@@ -602,7 +602,7 @@ private void button_savepdochanges_Click(object sender, EventArgs e)
 
                 int nodeoffset = 0;
 
-                if (eds.di.concreteNodeId != -1)
+                if (nodeidpresent && eds.di.concreteNodeId != -1)
                     nodeoffset = eds.di.concreteNodeId;
 
                 eds.ods[index].subobjects[1].defaultvalue = string.Format("0x{0:x8}", newnode-nodeoffset);