Catch some potential NPEs

James Moger

2015-11-18 def01db5f7dc1c607026528eed1dfd75c6e59779

 src/main/java/com/gitblit/servlet/RawServlet.java

@@ -468,7 +468,7 @@
            served = true;
         }
      } finally {
         tw.release();
         tw.close();
         rw.dispose();
      }