dirty reroute fix

src/main/java/com/example/application/views/abstractnavigation/SeasonAndMatchdayNavigationView.java

@@ -136,6 +136,13 @@ public abstract class SeasonAndMatchdayNavigationView extends Div implements Has
     public void setParameter(BeforeEvent beforeEvent, @WildcardParameter String param) {
         outer.removeAll();
 
+        // TODO: replace this with something more sensible
+        if (param.equals("")) {
+            navigate(UI.getCurrent(), "2020", "1");
+            setParameter(beforeEvent, "2020/1/");
+            return;
+        }
+
         if (!param.matches("^[0-9]*/[0-9]*/?$")) {
             invalidUrlLabel.setText("Invalid URL! Please provide params in the form season/matchday/");
             outer.add(invalidUrlLabel);