more protection for the cleanup thread

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7848 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/net/yacy/kelondro/rwi/IndexCell.java

@@ -108,7 +108,11 @@ public final class IndexCell<ReferenceType extends Reference> extends AbstractBu
     private class CleanupThread extends Thread {
         public void run() {
             while (IndexCell.this.cleanupShallRun) {
+                try {
                     cleanCache();
+                } catch (final Exception e) {
+                    Log.logException(e);
+                }
                 try { Thread.sleep(3000); } catch (final InterruptedException e) {}
             }
         }