-ability to change scripts in external editor and still have properties reloaded in godot UI, fixes #3003

core/io/resource_format_binary.cpp

@@ -853,6 +853,8 @@ String ResourceInteractiveLoaderBinary::get_unicode_string() {
 	if (len>str_buf.size()) {
 		str_buf.resize(len);
 	}
+	if (len==0)
+		return String();
 	f->get_buffer((uint8_t*)&str_buf[0],len);
 	String s;
 	s.parse_utf8(&str_buf[0]);