Fix NPE after other error in async rest handling.

cdstar-rest/src/main/java/de/gwdg/cdstar/rest/servlet/AsyncContextImpl.java

@@ -370,7 +370,6 @@ public class AsyncContextImpl implements AsyncContext, WriteListener, ReadListen
 
 			} catch (final Exception e) {
 				onError(e);
-				runInPool(null, null, e);
 			}
 		}
 	}