$REMOTEHOST is set to NULL on the local machine in csh and tcsh in RHEL 6

Issue

• $REMOTEHOST is set empty on the local machine in csh and tcsh

• Its expected that if tcsh can't determine the remote host (or that the user is not actually remote) that it wouldn't set this variable at all.

   $ env |grep REMOTE
  REMOTEHOST=
  $ who am i
  user pts/5        2011-01-07 18:12 (:0.0)
  user@system:log $ env |grep SHELL
  SHELL=/bin/tcsh
  

• Having it set to "" can break third party applications.