getFusedStats : erreur quand un clone n'a pas de nom

Pour #3530 j'ai lancé un essai qui a planté à cause de

Traceback (most recent call last):
  File "/usr/share/vidjil/server/web2py/gluon/restricted.py", line 219, in restricted
    exec(ccode, environment)
  File "/usr/share/vidjil/server/web2py/applications/vidjil/controllers/sample_set.py", line 1099, in <module>
  File "/usr/share/vidjil/server/web2py/gluon/globals.py", line 421, in <lambda>
    self._caller = lambda f: f()
  File "/usr/share/vidjil/server/web2py/applications/vidjil/controllers/sample_set.py", line 927, in multi_sample_stats
    results = getStatData(custom_result)
  File "/usr/share/vidjil/server/web2py/applications/vidjil/controllers/sample_set.py", line 887, in getStatData
    d = getFusedStats(fuse)
  File "/usr/share/vidjil/server/web2py/applications/vidjil/controllers/sample_set.py", line 756, in getFusedStats
    dest['main clone'] = data['clones'][0]['name']
KeyError: 'name'

En effet le clone dans ce fichier fused (fused_file.fused_file.8b52253674a3c8e6.3034343635382d32383737302e6675736564.fused) n'a pas de nom. Ça peut arriver.