TaurusNeXusBrowser errors

[sf-migrator-bot]

Hi,

I was looking at TaurusNeXusBrowser and I noticed that it throws a lot of Exceptions, e.g.

1. when there is unresolved link in a NeXus group there is not possible to look at least at other fields/links of this group but one get the following error:

   MainThread ERROR 2016-06-03 13:45:24,771 LogExceptHook: Unhandled exception:
   Traceback (most recent call last):
   File "/usr/lib/python2.7/dist-packages/PyMca/HDF5Widget.py", line 434, in rowCount
   return len(self.getProxyFromIndex(index))
   File "/usr/lib/python2.7/dist-packages/PyMca/HDF5Widget.py", line 296, in len
   return len(self.children)
   File "/usr/lib/python2.7/dist-packages/PyMca/HDF5Widget.py", line 195, in children
   items[i][0])
   AttributeError: 'NoneType' object has no attribute '_posixPath'

2. on viewing a string field one gets an infinite sequence of errors:

   MainThread ERROR 2016-06-03 13:47:29,635 LogExceptHook: Unhandled exception:
   Traceback (most recent call last):
   File "/usr/lib/python2.7/dist-packages/PyMca/NumpyArrayTableModel.py", line 52, in data
   return self._data(index, role)
   File "/usr/lib/python2.7/dist-packages/PyMca/NumpyArrayTableModel.py", line 65, in _data1D
   return MyQVariant(self._format % self._array[col])
   TypeError: float argument required, not unicode

3. a preview error

   MainThread ERROR 2016-06-03 11:58:16,882 LogExceptHook: Unhandled
   exception:
   Traceback (most recent call last):
   File "/usr/lib/python2.7/dist-packages/taurus/qt/qtgui/extra_nexus/taurusnexuswidget.py",
   line 114, in onHDF5WidgetSignal
   self.__currentPreview = self.neXusPreviewWidgetFactory(ddict)
   File
   "/usr/lib/python2.7/dist-packages/taurus/qt/qtgui/extra_nexus/taurusnexuswidget.py",
   line 132, in neXusPreviewWidgetFactory
   info = HDF5Info.getInfo(self.__nexusFile,ddict["name"])
   File "/usr/lib/python2.7/dist-packages/PyMca/HDF5Info.py", line 418,
   in getInfo
   memberObject = hdf5File[node][member]
   File "/usr/lib/python2.7/dist-packages/h5py/_hl/group.py", line 153,
   in getitem
   oid = h5o.open(self.id, self._e(name), lapl=self._lapl)
   File "h5o.pyx", line 173, in h5py.h5o.open (h5py/h5o.c:3405)
   KeyError: "unable to open object (Symbol table: Can't open object)"

Bests,
Jan

Reported by: jkotan ( http://sf.net/u/jkotan )

[sf-migrator-bot]

The error 2) (inifnite even loop) causes 100% usage of CPU which can be harmful for users.

Of course the infinite loop can be broken by clicking

Don't show this message again 

but it may be not straightforward for users.

Original comment by: jkotan (http://sourceforge.net/u/jkotan)