Improve error when Client.Subscribe
called on a client that will not work
#599
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Related to #596. If
Subscribe
was called on a client that didn't havea
Workers
bundle configure a nil pointer panic would occur becausesubscriptionManager
was never initialized.Here, leave that as a panic since it makes sense to warn a user about an
API misuse that'd undoubtedly lead to more confusion/pain, but improve
the error message so that it's more obvious to the caller why this is a
problem.
Fixes #596.