catbref 2ab695f308 NTP: don't call shutdownNow() on null instanceExecutor
When using fixed NTP offset, e.g. via "testNtpoffset" in settings.json,
Controller calls NTP.shutdownNow() which throws a NPE because
NTP.instanceExecutor is null.
2020-05-11 12:59:45 +01:00
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