[Bugs] #3605 journal UNSP: Details View broken for Documents folder

[Sugar Labs Bugs]

#3605: Details View broken for Documents folder
------------------------------------------+---------------------------------
    Reporter:  sascha_silbe               |          Owner:  ajay_garg        
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.96             
   Component:  journal                    |        Version:  Git as of bugdate
    Severity:  Major                      |       Keywords:                   
Distribution:                             |   Status_field:  New              
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 In latest sugar mainline master, the Details View for the Documents folder
 is incomplete (at least the technical metadata is missing) and the
 following exception appears in the log:

 {{{
 Traceback (most recent call last):
   File "/usr/lib/python2.7/dist-packages/gobject/__init__.py", line 101,
 in obj_set_property
     prop.setter(self, value)
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.7/site-
 packages/jarabe/journal/detailview.py", line 83, in set_metadata
     self._update_view()
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.7/site-
 packages/jarabe/journal/detailview.py", line 71, in _update_view
     self._expanded_entry.set_metadata(self._metadata)
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.7/site-
 packages/jarabe/journal/expandedentry.py", line 157, in set_metadata
     title.props.editable = model.is_editable(metadata)
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.7/site-
 packages/jarabe/journal/model.py", line 796, in is_editable
     return os.access(metadata['mountpoint'], os.W_OK)
 TypeError: coercing to Unicode: need string or buffer, NoneType found
 }}}

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3605>
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