Rust client: Fix warning on reconnects during crud uploads #676
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When a crud upload completes just after a stream iteration has already been cancelled, we may be pushing data into a closed stream, causing warnings. This adds a check to fix that problem.
I've added a test to reproduce the original issue. The issue is caused by a race condition and the test doesn't reproduce it very reliably, but I was able to trigger the reported issue and verify that this fixes it.