Fix bug clicking sample not assigned to puck

src/main/java/ch/psi/mxsc/BasePlatePanel.java

@@ -364,7 +364,9 @@ public class BasePlatePanel extends DevicePanel {
     
     void selectSample(Sample sample){
         if (getSelectionMode()==SelectionMode.Samples){
-            sample.setSelected(true);
+            if (sample!=null){
+                sample.setSelected(true);
+            }
             Controller.getInstance().onSamplePressed(sample);
             repaint();
         }
@@ -404,7 +406,11 @@ public class BasePlatePanel extends DevicePanel {
     
     void selectPuck(Puck puck){
         if (getSelectionMode()!=SelectionMode.None){
-            puck.setSelected(true);                     
+            if (puck != null){
+                puck.setSelected(true);                     
+            } else {
+                getDevice().resetSelection();
+            }
             Controller.getInstance().onPuckPressed(puck);
             repaint();     
         }        

src/main/java/ch/psi/mxsc/Controller.java

@@ -592,7 +592,7 @@ public class Controller {
     }
 
     void onSamplePressed(Sample sample) {
-        onPuckPressed(sample.getPuck());
+        onPuckPressed((sample==null)? null : sample.getPuck());
     }
 
     void onSampleReleased(Sample sample) {