when testing servers, don't propagate exceptions but do note them

desktop/src/main/java/net/monarchpass/piecannon/App.java

@@ -51,8 +51,16 @@ public class App {
     public static void testServers (final List<Server> servers) {
         log.log(Level.INFO, "Testing all defined servers");
         for (final Server server : servers) {
+            Object result;
+            try {
+                result = PieCannon.testServer(server);
+            }
+            catch (final Exception exception) {
+                result = exception;
+            }
+            
             log.log(Level.INFO, "{0} {1}: {2}", new Object[] {
-                server.getClass().getSimpleName(), server.getLabel(), PieCannon.testServer(server)
+                server.getClass().getSimpleName(), server.getLabel(), result
             });
         }
     }