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>

TehSAUCE/imagej,biovoxxel/imagej,biovoxxel/imagej,biovoxxel/imagej,TehSAUCE/imagej,TehSAUCE/imagej