Code review comment for lp://staging/~widelands-dev/widelands/bug-1695701-militarywindow-crash

Mhh, thats ood, last "normal" code in Debugger is:

void Panel::do_think() {
    if (thinks())
 think();

I don get it, where/when is BuildingWindow::building_ set to null?

looks like building_ point to some reclaimed space?