xds: fix NPE in wrr in TF state #10868
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YifeiZhuang
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The issues was introduced from 1.60
Before #10584 the WRR picker is only created for READY states, therefore the pick result is always A subchannel.
After #10584 the WRR picker is created for TF case, thus we may get a pick result that is empty.
fix b/287153892