fix(check): filter config files

Avoids error when `--config` is not provided.

Author: lewis6991

crates/emmylua_check/src/init.rs

@@ -50,7 +50,10 @@ pub fn load_workspace(
                 vec![
                     main_path.join(".luarc.json"),
                     main_path.join(".emmyrc.json"),
-                ],
+                ]
+                .into_iter()
+                .filter(|path| path.exists())
+                .collect(),
                 main_path.clone(),
             )
         };