Fix actor fails to recive batching messages if batchsize is less than…

[wuuer]

Fix actor fails to recive batching messages if batchsize is less than the number of messages in the batchingMailbox because of dead loop in the RunAsync method

Description

Purpose

This pull request is a:

• [✔ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ✔] I have added necessary documentation (if appropriate)

[CLAassistant]

All committers have signed the CLA.

[rogeralsing]

Nice catch!