Do not display fork button if target repo already exists (fixes #944)

James Moger

2015-11-10 c332d9a3d4d9485cfe60fb8dd9db7dbde971642c

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

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