Resolving bug on non set DownloadedFILEPath when downloading models

src/main/java/ui/networkmodelloader/JDialogLoadingNetworkModel.java

@@ -355,7 +355,11 @@ public class JDialogLoadingNetworkModel extends javax.swing.JFrame implements Ac
         jta.append("Loading model: " + fileName);
         String urlToLoad = URLManager.getBaseURL(url) + fileName;
         URLManager urlm = new URLManager();
-        filePath = ConfigurationTTool.DownloadedFILEPath + "/" + fileName;
+	if ((ConfigurationTTool.DownloadedFILEPath == null) || (ConfigurationTTool.DownloadedFILEPath.length() == 0)) {
+	    filePath = fileName;
+	} else {
+	    filePath = ConfigurationTTool.DownloadedFILEPath + "/" + fileName;
+	}
         boolean ok = urlm.downloadFile(filePath, urlToLoad,this);
         if (!ok) {
             jta.append("Model transfer failed\nPlease, select another model, or retry\n");