fix(execution): ast_void does not affect return value => if statements now work

src/execution/execution.c

@@ -245,6 +245,7 @@ int execution(struct ast *ast, struct hash_map *vars)
         while (cur)
         {
             struct ast *child = (struct ast *)cur->data;
+            if (!ast_is_void(child))
                 ret = execution(child, vars);
             cur = cur->next;
         }