delete crawl queue on init exception

(happens occasionally on path name vaiolation and will never get resolved)

source/net/yacy/crawler/HostBalancer.java

@@ -87,7 +87,7 @@ public class HostBalancer implements Balancer {
     }
 
     /**
-     * fills the queue with by scanning the hostsPath directory in a thread to
+     * fills the queue by scanning the hostsPath directory in a thread to
      * return immediately (as large unfinished crawls may take longer to load)
      */
     private void init() {
@@ -106,7 +106,9 @@ public class HostBalancer implements Balancer {
                             queues.put(DigestURL.hosthash(queue.getHost(), queue.getPort()), queue);
                         }
                     } catch (MalformedURLException | RuntimeException e) {
-                        log.warn("init error for " + hostsPath.getName() + " host=" + hoststr + " " + e.getLocalizedMessage());
+                        log.warn("delete queue due to init error for " + hostsPath.getName() + " host=" + hoststr + " " + e.getLocalizedMessage());
+                        // if exception thrown we can't init the queue, maybe due to name violation. That won't get better, delete it.
+                        FileUtils.deletedelete(new File(hostsPath, hoststr));
                     }
                 }
             }

source/net/yacy/crawler/HostQueue.java

@@ -101,7 +101,11 @@ public class HostQueue implements Balancer {
         this.port = Integer.parseInt(filename.substring(p + 1)); // consider "host.com" contains dot but no required port -> will throw exception
         init();
     }
-    
+
+    /**
+     * Opens and initializes the host queue
+     * @throws MalformedURLException if directory for the host could not be created
+     */
     private final void init() throws MalformedURLException {
         try {
             if (this.hostName == null)