Fix/workaround crash:
authorCarl Hetherington <cth@carlh.net>
Fri, 3 May 2019 01:32:46 +0000 (01:32 +0000)
committerCarl Hetherington <cth@carlh.net>
Fri, 3 May 2019 11:35:17 +0000 (12:35 +0100)
../src/common/dpycmn.cpp(119): assert "n <GetCount ()" failed in wxDisplay (): An invalid index was passed to wxDisplay

seen on Ubuntu 19.04; I can't reproduce it myself but the user reports that
this fixes it.


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