[issue34334] QueueHandler logs exc_info twice

[Vinay Sajip]

Vinay Sajip <vinay_sajip at yahoo.co.uk> added the comment:

> Patching QueueHandler.prepare() to set exc_text to None seems to fix this.

I'm not sure that's the right fix. The change appears to have come from this commit:

https://github.com/python/cpython/commit/adfe3440f65dfd6cf4463db6cd02cdc78e77ce17

Specifically, the prepare() method.

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