fixed drop errors for database initialization

src/lib.rs

@@ -30,7 +30,7 @@ fn jspg_failure() -> JsonB {
     code: "ENGINE_NOT_INITIALIZED".to_string(),
     message: "JSPG extension has not been initialized via jspg_setup".to_string(),
     details: crate::drop::ErrorDetails {
-      path: "".to_string(),
+      path: None,
       cause: None,
       context: None,
       schema: None,