add empty check

Author: AndPuQing

Python/codegen.c

@@ -825,6 +825,9 @@ codegen_process_deferred_annotations(compiler *c, location loc)
     void *key = (void *)((uintptr_t)ste->ste_id + 1);
 
     // Get the first annotation location
+    if (PyList_GET_SIZE(deferred_anno) == 0) {
+        goto error;
+    }
     PyObject* ptr = PyList_GET_ITEM(deferred_anno, 0);
     stmt_ty st = (stmt_ty)PyLong_AsVoidPtr(ptr);
     if (st == NULL) {