[med-svn] [python-mne] 22/353: ENH : more informative error message in read vol iop

[Yaroslav Halchenko]

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yoh pushed a commit to tag 0.4
in repository python-mne.

commit 1171603b2291e5a418014ff3bea8530634ec29be
Author: Alexandre Gramfort <alexandre.gramfort at inria.fr>
Date:   Fri Dec 9 12:00:27 2011 +0100

    ENH : more informative error message in read vol iop
---
 mne/source_space.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mne/source_space.py b/mne/source_space.py
index addfc5d..74b0e03 100644
--- a/mne/source_space.py
+++ b/mne/source_space.py
@@ -142,7 +142,11 @@ def _read_one_source_space(fid, this):
         if tag is not None:
             res['src_mri_t'] = tag.data
 
-        mri = dir_tree_find(this, FIFF.FIFFB_MNE_PARENT_MRI_FILE)[0]
+        parent_mri = dir_tree_find(this, FIFF.FIFFB_MNE_PARENT_MRI_FILE)
+        if len(parent_mri) == 0:
+            raise ValueError('Can not find parent MRI location')
+
+        mri = parent_mri[0]
         for d in mri['directory']:
             if d.kind == FIFF.FIFF_COORD_TRANS:
                 tag = read_tag(fid, d.pos)

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