Launcher: avoid Segmentation Fault when no icon is available
Launcher: avoid Segmentation Fault when no icon is available

In other words: be nice.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

imagej/imagej-launcher,imagej/imagej-launcher,imagej/imagej-launcher