remove unused exception

Author: vladak

opengrok-indexer/src/main/java/org/opengrok/indexer/history/HistoryGuru.java

@@ -200,19 +200,17 @@ private boolean useAnnotationCache() {
      * Get a string with information about the history cache.
      *
      * @return a free form text string describing the history cache instance
-     * @throws HistoryException if an error occurred while getting the info
      */
-    public String getHistoryCacheInfo() throws HistoryException {
+    public String getHistoryCacheInfo() {
         return historyCache == null ? "No history cache" : historyCache.getInfo();
     }
 
     /**
      * Get a string with information about the annotation cache.
      *
      * @return a free form text string describing the history cache instance
-     * @throws HistoryException if an error occurred while getting the info
      */
-    public String getAnnotationCacheInfo() throws HistoryException {
+    public String getAnnotationCacheInfo() {
         return annotationCache == null ? "No annotation cache" : annotationCache.getInfo();
     }