From 6c8adf47b3286d974312821795f8bea0b484bf13 Mon Sep 17 00:00:00 2001
From: Ray Speth <speth@mit.edu>
Date: Mon, 16 Sep 2019 18:02:50 -0400
Subject: [PATCH] [Input] Normalize YAML reaction equation for Chebyshev
 reactions

Fix the reaction equation to always include the (+M). Previously, if the (+M)
was omitted, an invalid reaction string was generated.
---
 interfaces/cython/cantera/ck2yaml.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/interfaces/cython/cantera/ck2yaml.py b/interfaces/cython/cantera/ck2yaml.py
index 39df856bf..30dd39edc 100644
--- a/interfaces/cython/cantera/ck2yaml.py
+++ b/interfaces/cython/cantera/ck2yaml.py
@@ -498,7 +498,7 @@ class Chebyshev(KineticsModel):
         self.quantity_units = quantity_units
 
     def reaction_string_suffix(self, species):
-        return ' (+{})'.format(species)
+        return ' (+{})'.format(species if species else 'M')
 
     def reduce(self, output):
         output['type'] = 'Chebyshev'