06801955a bound $this->Id() directly in the stats lookup. On a
single-server install the Server object's Id() is empty/undef and
zmstats.pl writes the rows under ServerId=0 (ZM_SERVER_ID ? ZM_SERVER_ID
: 0), so the query matched nothing and CpuLoad/load reported as -1.
Coerce a falsy id to 0 so the reader mirrors the writer; a real
(multi-server) id still passes through unchanged.
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