bugfix: check callback to avoid std::bad_function_call exception #456
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Fixes #455
Motivation
Fixed the bug that when reading messages from a non-persistent topic with
Reader, it throwstd::bad_function_callexception.Modifications
Check
checkbackbefore calling it inAckGroupingTracker.Verifying this change
(Please pick either of the following options)
This change is a trivial rework / code cleanup without any test coverage.
Documentation
doc-required(Your PR needs to update docs and you will update later)
doc-not-needed(Please explain why)
A simple bug fix.
doc(Your PR contains doc changes)
doc-complete(Docs have been already added)