Bug 507546 - fixed IllegalArgumentException on code mining dispose Change-Id: Ia1ae9e513b023fc33026a6cdd73d2fd16159bdbb Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.debug/+/190795 Tested-by: Andrey Loskutov <loskutov@gmx.de> Reviewed-by: Andrey Loskutov <loskutov@gmx.de>