add ring length

pyatsoleiloutils/ltandmomap.py

@@ -22,7 +22,8 @@ def getmomaphdf5_SOLEIL_II(ring, foutn='momap.hdf5', **kwargs):
             foutn,
             dpb,
             s_indexes,
-            s_array
+            s_array,
+            ring_length=len(ring)
             )
 
 def getmomap_SOLEIL_II(ring, **kwargs):