[ctml2yaml] Fix integer-like reaction IDs error

reaction_id nodes that look like integers (e.g., '0001') are being read
as integers by the parser and converting them to strings throws errors.
The fix is to only include the reaction_id if it doesn't look like an
integer.

interfaces/cython/cantera/ctml2yaml.py

@@ -526,7 +526,13 @@ def convert(inpfile, outfile):
         reaction_attribs = {}
         reaction_id = reaction.get("id", False)
         if reaction_id:
-            reaction_attribs["id"] = reaction_id
+            # If the reaction_id can be converted to an integer, it was likely
+            # added automatically, so there's no need to include it in the
+            # output.
+            try:
+                reaction_id = int(reaction_id)
+            except ValueError:
+                reaction_attribs["id"] = reaction_id
         reaction_type = reaction.get("type")
         rate_coeff = reaction.find("rateCoeff")
         if reaction_type in [None, "threeBody", "plog", "chebyshev", "surface", "edge"]: