Fixed empty uptime journal case.

src/fr/devinsy/statoolinfos/uptime/UptimeJournal.java

@@ -309,6 +309,10 @@ public class UptimeJournal
         {
             result = false;
         }
+        else if (isEmpty())
+        {
+            result = false;
+        }
         else
         {
             boolean ended = false;
@@ -340,6 +344,21 @@ public class UptimeJournal
         return result;
     }
 
+    /**
+     * Checks if is empty.
+     *
+     * @return true, if is empty
+     */
+    public boolean isEmpty()
+    {
+        boolean result;
+
+        result = this.map.isEmpty();
+
+        //
+        return result;
+    }
+
     /**
      * Purge.
      *