fixes to Ian50Body, Ian50

For @tghoward et al to test, per #156

decocare/history.py

@@ -270,6 +270,12 @@ class Ian69(KnownRecord):
 class Ian50(KnownRecord):
   opcode = 0x50
   body_length = 34
+
+  # XXX: tghoward testing on 723 at length 30
+  body_length = 30
+  def __init__ (self, head, model, **kwds):
+    super(Ian50, self).__init__(head, model, **kwds)
+    self.body_length = model.Ian50Body
 _confirmed.append(Ian50)
 
 class Ian54(KnownRecord):
@@ -702,7 +708,7 @@ def decode (self):
     try:
       return (dict(valid_date=date(*mid).isoformat()))
     except ValueError, e:
-      return (dict(error_date=mid))
+      return (dict(error_date=mid, error=str(e)))
 
 _confirmed.append(Sara6E)
 

decocare/models/__init__.py

@@ -79,6 +79,7 @@ class PumpModel (object):
   basal_strokes = 40
   MMOL_DEFAULT = False
   larger = False
+  Ian50Body = 30
   def __init__(self, model, session):
     self.model = model
     self.session = session
@@ -254,9 +255,11 @@ class Model723 (Model523):
   pass
 
 class Model530 (Model523):
+  Ian50Body = 34
   pass
 
 class Model730 (Model530):
+  Ian50Body = 34
   pass
 
 class Model540 (Model530):