Description of problem:
Install rhc client on Windows with gem install.
Try to use rhc command combine with grep will get backtrace error.

$ rhc domain show -predhat |grep http

Version-Release number of selected component (if applicable):
rhc-1.9.6

How reproducible:
always

Steps to Reproduce:
1.Install rhc-1.9.6 on Windows via gem install
2.Try to use rhc command with pipe and grep
$ rhc domain show -predhat |grep http

Actual results:
$ rhc domain show -p123123 |grep ruby
DL is deprecated, please use Fiddle
c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_extensions.rb
:279:in `*': no implicit conversion from nil to integer (TypeError)
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:279:in `block in rows'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:278:in `tap'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:278:in `rows'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:70:in `say'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:102:in `header'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/helpers.r
b:257:in `block (2 levels) in <module:Helpers>'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/output_he
lpers.rb:38:in `block in display_app'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:177:in `call'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:177:in `section'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:191:in `paragraph'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/helpers.r
b:257:in `block (2 levels) in <module:Helpers>'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/output_he
lpers.rb:37:in `display_app'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/commands/
domain.rb:64:in `block (2 levels) in show'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/commands/
domain.rb:63:in `each'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/commands/
domain.rb:63:in `block in show'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/highline-1.6.18/lib/highlin
e.rb:676:in `indent'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/highline_
extensions.rb:104:in `header'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/helpers.r
b:257:in `block (2 levels) in <module:Helpers>'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/commands/
domain.rb:62:in `show'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/commands.
rb:241:in `execute'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/commands.
rb:232:in `block (3 levels) in to_commander'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.1.3/lib/command
er/command.rb:180:in `call'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.1.3/lib/command
er/command.rb:155:in `run'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.1.3/lib/command
er/runner.rb:400:in `run_active_command'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/command_r
unner.rb:73:in `run!'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.1.3/lib/command
er/delegates.rb:7:in `run!'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/lib/rhc/cli.rb:36
:in `start'
        from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/rhc-1.9.6/bin/rhc:20:in `<t
op (required)>'
        from c:/Ruby200-x64/bin/rhc:23:in `load'
        from c:/Ruby200-x64/bin/rhc:23:in `<main>'

Expected results:
Should get the correct result.

Additional info:

$gem list
archive-tar-minitar (0.5.2)
bigdecimal (1.2.0)
commander (4.1.3)
highline (1.6.18)
httpclient (2.3.3)
io-console (0.4.2)
json (1.7.7)
minitest (4.3.2)
net-ssh (2.6.7)
open4 (1.3.0)
psych (2.0.0)
rake (0.9.6)
rdoc (4.0.0)
rhc (1.9.6, 1.9.4)
test-unit (2.0.0.0)