Catch IllegalStateException for late started events if the current
plug-in was already stopped.

Change-Id: I26658a535e94d3d1149447436eb7dd5e186f73bb
Signed-off-by: Philipp Kunz <philipp.kunz@paratix.ch>
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>