reduced danger that Tray does not initialize

source/net/yacy/gui/Tray.java

@@ -108,7 +108,7 @@ public final class Tray {
                 } else {
                     System.setProperty("java.awt.headless", "true");
                 }
-			} catch (final Exception e) {
+            } catch (final Throwable e) {
                 System.setProperty("java.awt.headless", "true");
             }
         }
@@ -167,7 +167,7 @@ public final class Tray {
         }
     }
 
-	private static void setDockIcon(Image icon) {
+    private static void setDockIcon(final Image icon) {
         if (!OS.isMacArchitecture || setDockIconImage == null || applicationInstance == null) return;
         try {
             setDockIconImage.invoke(applicationInstance, icon);