Sufficient?

### Observed behaviour
Game crashes from Options menu shortly after startup if procedure is followed. Could not reproduce by skipping steps.

### Expected behaviour
Pull-down menu for planet detail level should pop down. Does if steps are skipped.

### Steps to reproduce
```
open game (from FM or from terminal)
Click Options
Click resolutions
esc to close resolutions pulldown
click planet detail pulldown - Crash

error message:
Loading took: 14986.228890 milliseconds
pioneer: Context.cpp:99: void UI::Context::DropLayer(): Assertion `m_layers.size() > 1' failed.
Aborted (core dumped)
```

__My pioneer version (and OS):__
pioneer20170415-linux64