[Rock-dev] orocos/configuration.rb: no warning on non-existent file

[Martin Zenzes]

Hi,

while following the tutorial [1], I made a typo trying loading a 
configuration-file in the tasks ruby-script:

{{{
     message_producer.apply_conf_file("unintnetional_typo.yml")
}}}

After following the code, it looks like the "load_file" function in 
"tools/orocos.rb/lib/orocos/configuration.rb" silently returns on 
non-existent filenames, instead if issuing a warning.

Wouldn't be a message nice? See attached patch.

Greetings
     Martin

[1] 
http://rock-robotics.org/stable/documentation/tutorials/120_basics_configure_component.html

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   M.Sc. Martin Zenzes
   Space Robotics

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