[init] fixed hci (full protocol) argument

bob/db/hci_tagging/__init__.py

@@ -41,7 +41,7 @@ class Database(object):
       d = resource_filename(__name__, os.path.join('data', 'li_samples_cvpr14.txt'))
       with open(d, 'rt') as f: sessions = f.read().split()
       return [File(**k) for k in self.metadata if k['basedir'] in sessions]
-    else:
+    elif protocol is not None:
       raise RuntimeError('Protocol should be either "cvpr14" or not set. The value %s is not valid' % protocol)
 
     return [File(**k) for k in self.metadata]