catch a replay system do_load edge case crash

src/game/boe.actions.cpp

@@ -2804,6 +2804,13 @@ bool handle_scroll(const sf::Event& event) {
 }
 
 void do_load() {
+	// Edge case: Replay can be cut off before a file is chosen,
+	// or party selection can be canceled, and this will cause
+	// a crash trying to decode a party
+	if(replaying && !has_next_action("load_party")){
+		return;
+	}
+
 	fs::path file_to_load = nav_get_or_decode_party();
 	if(file_to_load.empty()) return;
 	if(!load_party(file_to_load, univ))