From 126dc9e04ca5a2a547c419b834e34a9014270656 Mon Sep 17 00:00:00 2001
From: Ray Speth <speth@mit.edu>
Date: Fri, 30 Mar 2012 23:47:24 +0000
Subject: [PATCH] Print error message when missing species thermo

---
 interfaces/python/ck2cti.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/interfaces/python/ck2cti.py b/interfaces/python/ck2cti.py
index 134436d6a..af93cc9f9 100644
--- a/interfaces/python/ck2cti.py
+++ b/interfaces/python/ck2cti.py
@@ -81,6 +81,7 @@ class Species(object):
         self.thermo = None
         self.transport = None
         self.note = None
+        self.composition = None
 
     def __str__(self):
         return self.label
@@ -1648,6 +1649,8 @@ def writeCTI(species,
     for s in species:
         if not s.transport:
             haveTransport = False
+        if s.composition is None:
+            raise ChemkinError('No thermo data found for species: {0!r}'.format(s.label))
         elements.update(s.composition)
         speciesNameLength = max(speciesNameLength, len(s.label))