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When using the Background context, the Done channel is nil
Issue #, if available:
#51
Description of changes:
Don't bother selecting a nil channel because it waits forever and leaks memory.
Issue 51 has a more comprehensive fix suggested by Cyberax, but if not going to integrate that fix or there some hold-up, at least make this trivial fix in the mean time.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.