treat default error string case for file name

CurrentScanResultBean/src/main/java/fr/soleil/bean/scanserver/CurrentScanResultBean.java

@@ -37,6 +37,7 @@ import javax.swing.JTabbedPane;
 import javax.swing.WindowConstants;
 
 import fr.soleil.comete.box.AbstractTangoBox;
+import fr.soleil.comete.box.scalarbox.StringScalarBox;
 import fr.soleil.comete.definition.widget.properties.ChartProperties;
 import fr.soleil.comete.definition.widget.properties.ImageProperties;
 import fr.soleil.comete.definition.widget.properties.PlotProperties;
@@ -326,7 +327,7 @@ public class CurrentScanResultBean extends AbstractTangoBox
 
             @Override
             public void setText(String file) {
-                if (file != null && !file.isEmpty()) {
+                if (file != null && !file.isEmpty() && !StringScalarBox.DEFAULT_ERROR_STRING.equals(file)) {
                     String fileName = file;
                     int index = file.lastIndexOf(TangoDeviceHelper.SLASH);
                     if (index > -1) {