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Description of problem:
First of all, I don't have ~/.Xclients, ~/.Xclients-default.
When I run " switchdesk xfce " without installing xfce,
the command return "ERROR: XFCE not installed!". This is correct
detection.
But at the same time, this command create .Xclients.
Then I run "startx" , X failed to start with following error message.

/home/hoge/.Xclients: line 8: /home/hoge/.Xclients-default: No Such
file or directory. 
/home/hoge/.Xclients: line 8: /home/hoge/.Xclients-default: cannot
execute: No such file or directory.

There is no .Xclients-default file. 
But in this case, I think, switchdesk should not create .Xclients
file if it was not there before.

Version-Release number of selected component (if applicable):
switchdesk-4.0.3-1

How reproducible:
Always

Steps to Reproduce:
1. Delete ~/.Xclients, ~/.Xclients-default file.
2. Make sure xfce filesets are not installed.
3. Run $ switchdesk xfce 
    

Actual Results:  switchdesk detect no XFCE filesets are installed,
then just quit.
At the moment, switchdesk creats ~/.Xclients. But no .Xclients-default.
After this, startx failed to start X Window.

Expected Results:  switchdesk detect no XFCE filesets are installed,
then just quit
without creating .Xclients (if the file is not exist before swithdesk
is executed).


Additional info:

  Workaround : Delete .Xclients and .Xclients-default.