core: fix NPE in ConfigSelectingClientCall (backport v1.36.x) #8091
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Fix the following bug: ManagedChannelImpl.ConfigSelectingClientCall may return early in start() leaving delegate null, and fails request() method after start(). Currently the bug can only be triggered when using xDS.
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Backport of #8087
Fix the following bug:
ManagedChannelImpl.ConfigSelectingClientCall may return early in start() leaving delegate null, and fails request() method after start().
Currently the bug can only be triggered when using xDS.