Merge remote-tracking branch 'refs/remotes/upstream/pr/22619' into eliza/token-trie-sampler

# Conflicts:
#	tools/server/server-context.cpp

Author: lalalune

tools/server/server-context.cpp

@@ -2962,7 +2962,7 @@ struct server_context_impl {
                             SLT_ERR(slot, "failed to process image, res = %d\n", res);
                             send_error(slot, "failed to process image", ERROR_TYPE_SERVER);
                             slot.release();
-                            continue;
+                            break;
                         }
 
                         if (ctx_dft) {
@@ -2986,6 +2986,10 @@ struct server_context_impl {
                         has_mtmd = true;
                     }
 
+                    if (!slot.is_processing()) {
+                        continue;
+                    }
+
                     const int32_t checkpoint_before_last_user_token = slot.task->params.checkpoint_before_last_user_token;
 
                     // add prompt tokens for processing in the current batch