Fix potential NPE in DesktopIntegration.notifyLinux

client/src/main/java/ctbrec/ui/DesktopIntegration.java

@@ -135,6 +135,8 @@ public class DesktopIntegration {
             });
             new Thread(new StreamRedirector(p.getInputStream(), System.out)).start(); // NOSONAR
             new Thread(new StreamRedirector(p.getErrorStream(), System.err)).start(); // NOSONAR
+        } catch (NullPointerException e) {
+            // can happen at start, ignore
         } catch (IOException e1) {
             LOG.error("Notification failed", e1);
         }