Offline Upgrade fails if ip file is empty on Linux

If the ip file under /opt/couchbase/var/lib/couchbase is empty, offline upgrade will not start transfer data.

[root@thor08 ~]# time rpm -U couchbase-server-enterprise_x86_64_2.0.0-1976-rel.rpm
Stopping couchbase-server ...
Stopping couchbase-server
Upgrading couchbase-server ...
/opt/couchbase/bin/install/cbupgrade -c /opt/couchbase/var/lib/couchbase/config -a yes
Automatic mode: running without interactive questions or confirmations.
Upgrading your Couchbase Server to 2.0.0-1976-rel.
The upgrade process might take awhile.
NOTE: all item data will be read from 1.8.x sqlite database files
and converted to new files in 2.0 couchstore file format. This can
be a lengthy, slow operation for large datasets and/or fragmented
database files.
Analysing...
Previous config.dat file is /opt/couchbase/var/lib/couchbase/config/config.dat
Target node: ns_1@127.0.0.1
ERROR: no previously configured dbdir
Starting couchbase-server[ OK ]

You have successfully installed Couchbase Server.
Please browse to http://thor08:8091/ to configure your server.
Please refer to http://couchbase.com for additional resources.

Please note that you have to update your firewall configuration to
allow connections to the following ports: 11211, 11210, 11209, 4369,
8091 and from 21100 to 21299.

By using this software you agree to the End User License Agreement.
See /opt/couchbase/LICENSE.txt.

Stopping couchbase-serverNOTE: shutdown failed

real 0m14.480s
user 0m5.445s
sys 0m1.660s