nifi: Backport NIFI-16294 to guard against a null controller status in SiteToSiteStatusReportingTask during startup, for 2.6.0, 2.7.2, and 2.9.0 - #1629
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soenkeliebau wants to merge 4 commits into
2.6.0, 2.7.2, and 2.9.0 - #1629