[schema] Print the JSON content on decoding error

beat/core/schema/__init__.py

@@ -94,7 +94,11 @@ def load_schema(schema_name, version=1):
 
     with open(fname, "rb") as f:
         data = f.read().decode()
-        schema = json.loads(data)
+        try:
+            schema = json.loads(data)
+        except json.errors.JSONDecodeError:
+            print("Invalid json:\n {data}".format(data))
+            raise
 
     basedir = os.path.realpath(os.path.dirname(fname))
     resolver = jsonschema.RefResolver("file://" + basedir + "/", schema)