Ensure role config file exists before loading to prevent errors

The problem was that the application tried to load a roles configuration file without checking whether it actually exists, potentially leading to unhandled exceptions if the file is missing.

Ensure that the roles configuration file exists before attempting to read from it; raise an exception with a clear message if the file is not found.

diff --git a/py/roles.py b/py/roles.py:
-if not os.path.exists(roles_config_path):
-    raise Exception(f"Role config file does not exist: {roles_config_path}")
-

1 files changed, 3 insertions, 0 deletions

diff --git a/py/roles.py b/py/roles.py
index 7c7cf13..a8689f2 100644
--- a/py/roles.py
+++ b/py/roles.py
@@ -3,6 +3,9 @@ import os
 import configparser
 
 roles_config_path = os.path.expanduser(vim.eval("g:vim_ai_roles_config_file"))
+if not os.path.exists(roles_config_path):
+    raise Exception(f"Role config file does not exist: {roles_config_path}")
+
 roles = configparser.ConfigParser()
 roles.read(roles_config_path)