Bug 574729 - avoid calling System::setSecurityManager with null

Change-Id: I22b97871a6348c76ee48a380bf48670dd81aa9b4
Signed-off-by: Thomas Watson <tjwatson@us.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/equinox/rt.equinox.framework/+/182992
Tested-by: Equinox Bot <equinox-bot@eclipse.org>
1 file changed