luigi 7cb243d2f4 Avoid dereferencing a null pointer in ro_rt.
This was always broken in HEAD (the offending statement was introduced
in rev. 1.123 for HEAD, while RELENG_4 included this fix (in rev.
1.99.2.12 for RELENG_4) and I inadvertently deleted it in 1.99.2.30.

So I am also restoring these two lines in RELENG_4 now.
We might need another few things from 1.99.2.30.
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