Fixes inject_client in scenarios where the client kwarg is passed None

[desertaxle]

Example

Got a report of failures saving blocks from the Slack community. Blocks could be saved outside of flows, but not within flows. Root cause seems to be that inject_client was working when creating a new client, but not when retrieving an existing one for functions that had a default value of None due to setdefault behavior. This change pops client from kwargs in all scenarios to allow setdefault to do it's thing.

Closes #6940

Checklist

• This pull request references any related issue by including "closes <link to issue>"
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• This pull request includes a label categorizing the change e.g. fix, feature, enhancement

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[zanieb]

I believe this is when None is passed, not when it is the default. **kwargs doesn't peek at the wrapped function to determine if there are default values here. Similar issue regardless.