TMSS-710: Fixed syntax error and resolving references to root in resolve_path.

LCS/PyCommon/json_utils.py

@@ -163,11 +163,15 @@ def resolve_path(schema, reference: str):
     parts = reference.strip('/').split('/')
     subschema = schema
 
+    if parts == ['']:
+        # reference to root
+        return schema
+
     try:
         for part in parts:
             subschema = subschema[part]
     except KeyError as e:
-        raise KeyError("Could not resolve path %s in schema %s" % (path, schema)) from e
+        raise KeyError("Could not resolve path %s in schema %s" % (reference, schema)) from e
 
     return subschema