[Xastir] xastir crash

[Matt Werner]

I just had xastir crash.  It was in the middle of redrawing the maps when I
told it to index all maps.

Here's what I got on the xterm it was running from:

xastir: error.c:738: ThrowException: Assertion `exception->signature ==
0xabacadabUL' failed.

It's the first and only time I've ever had the program crash, so no
complaints here, just FYI to anyone that may care...

73 - Matt