[issue168] Change error message, when no smart-gui is installed

[Frank Köster at Labix Tracker]

New submission from Frank Köster <frank.koester at online.de>:

When having smart installed, but not the smart-gui, it is
still possible to execute the "smart --gui" command.

The error message "error: Interface 'gtk' not available" appears. I think this
is a bit misleading. Think about something like "error: The smart-gui is not
available, please install it"

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messages: 522
nosy: frank
priority: wish
project: smart
status: unread
title: Change error message, when no smart-gui is installed

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Labix issue tracker <tracker at labix.org>
<http://tracker.labix.org/issue168>
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