Make preview resistent to nothing being selected
authorH.G.Muller <hgm@hgm-xboard.(none)>
Wed, 20 Apr 2016 21:56:31 +0000 (23:56 +0200)
committerH.G.Muller <hgm@hgm-xboard.(none)>
Wed, 20 Apr 2016 21:56:31 +0000 (23:56 +0200)
commite13fd4c370773a8f4ddb364f7102caceb1513ea7
tree3ed8ef42b32da438bcb9823b3630212b9711f26c
parentc1d1ad880f230c340839df52e61c822896a739e4
Make preview resistent to nothing being selected

The name of the selected file could be a null pointer, and ScaleOnePiece
does not like that for a pieceImageDirectory.
gtk/xoptions.c