fixed: when incrementing space tables iterators in [for] statements we should invalidate indices for nested tables

src/generator.h

@@ -1447,6 +1447,7 @@ void Generator<StreamType, is_pikotools_stream, is_autoescape_stream>::CallSpace
 	{
 		// we are in [for...]statement, increment iterator and check the range
 		space_wrapper.increment_iterator(model_wrapper_space_table_index, table->size());
+		space_wrapper.invalidate_iterators(model_wrapper_space_table_index + 1);
 		size_t iterator_value = space_wrapper.get_space_iterator_value(model_wrapper_space_table_index);
 		last_res = (iterator_value < table->size());
 	}