fix: removed unnecessary regenerate logic for sessions and use the same logic for all contexts; prevents a panic on empty message list

src/config/session.rs

@@ -628,15 +628,6 @@ impl Session {
         let mut messages = self.messages.clone();
         if input.continue_output().is_some() {
             return messages;
-        } else if input.regenerate() {
-            while let Some(last) = messages.last() {
-                if !last.role.is_user() {
-                    messages.pop();
-                } else {
-                    break;
-                }
-            }
-            return messages;
         }
         let mut need_add_msg = true;
         let len = messages.len();