fixing ArrayIndexOutOfBoundsException for empty "series" name in case of FlexibleLeaderboard

Change-Id: I6986f8921315b248d57cabc449e40adb1ea95eab

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/home/desktop/partials/multiregattalist/MultiRegattaListStepsBody.java

@@ -101,7 +101,11 @@ public class MultiRegattaListStepsBody extends UIObject implements RequiresResiz
         String[] tokens = seriesName.split(" ");
         StringBuilder initials = new StringBuilder();
         for (int i = 0; i < tokens.length; i++) {
-            initials.append(tokens[i].charAt(0));
+            if (tokens[i].isEmpty()) {
+                initials.append('R');
+            } else {
+                initials.append(tokens[i].charAt(0));
+            }
         }
         return initials.toString();
     }