[Bugs] #1755 UNSP: sugar-emulator: better error message if X server is unreachable

[Sugar Labs Bugs]

#1755: sugar-emulator: better error message if X server is unreachable
------------------------------------------+---------------------------------
    Reporter:  sascha_silbe               |          Owner:  sascha_silbe     
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Trivial                    |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  Assigned         
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 Seems I didn't test the error case of not being able to connect to the X
 server at all. Reported by yevlempy on sugar-devel:

 {{{
 Xephyr cannot open host display. Is DISPLAY set?

 Xephyr cannot open host display. Is DISPLAY set?

 Xephyr cannot open host display. Is DISPLAY set?

 Xephyr cannot open host display. Is DISPLAY set?

 Xephyr cannot open host display. Is DISPLAY set?

 Xephyr cannot open host display. Is DISPLAY set?

 Xephyr cannot open host display. Is DISPLAY set?

 Xephyr cannot open host display. Is DISPLAY set?
 xrdb: No such file or directory
 xrdb: Can't open display ':39'
 Window manager error: Unable to open X display :39
 1267079814.2631569 STARTUP: Starting the shell
 Traceback (most recent call last):
   File "/home/Rinki/project/sugar-jhbuild/install/bin/sugar-session", line
 32, in <module>
     import gtk
   File "/usr/lib/python2.6/site-packages/gtk-2.0/gtk/__init__.py", line
 64, in <module>
     _init()
   File "/usr/lib/python2.6/site-packages/gtk-2.0/gtk/__init__.py", line
 52, in _init
     _gtk.init_check()
 RuntimeError: could not open display
 Traceback (most recent call last):
   File "<string>", line 1, in <module>
   File "/home/Rinki/project/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/util/emulator.py", line 156, in main
     _kill_pipe(server)
   File "/home/Rinki/project/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/util/emulator.py", line 80, in _kill_pipe
     os.kill(pipe.pid, signal.SIGTERM)
 AttributeError: 'NoneType' object has no attribute 'pid'
 }}}

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1755>
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