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Before this commit, it was possible for a request to be sent on the `chanWatchRequests` channel in `WaitForChannelPolicyUpdate` and then for the `ticker.C` case to select _before_ the `eventChan` select gets triggered when the `topologyWatcher` closes the `eventChan` in its call to `handlePolicyUpdateWatchRequest`. This could lead to a "close of a closed channel" panic. To fix this, this commit ensures that we only move on to the next iteration of the select statement in `WaitForChannelPolicyUpdate` once the request sent on `chanWatchRequests` has been fully handled.