RLink Forwarding Issue

[Skully17]

Fix for #2079

• Corrected param name
• Added variable for repetitively accessed dictionary value
• extended if statement to also check if "sub" is not None to see if the subscription has actually been made.
• Added on_remote_leave to empty dictionary of forwarded subscriptions
• extended if statement to also check if "reg" is not None to see if the registration has actually been made.
• Made "create forwarding registration" log debug level to match the subscription one. This is expected functionality and there can be large amounts of registrations which would cause log spam.

[oberstet]

alright, GH is confusing me:

1. since this PR is older than 90 days, the logs have been deleted by GH
2. because of this issue https://github.com/orgs/community/discussions/49242, one cannot then restart the PR from the GH web UI to generate new log
3. because of that, I create a completely new PR branching from this PR here https://github.com/crossbario/crossbar/pull/2090
4. the CI is now running on this new PR https://github.com/crossbario/crossbar/pull/2090

... BUT:

this PR above now also shows the CI as running even though the PRs are 2 different PRs.

mmmh. my best bet is that the CI integration in GH only looks at the actual code changes, no matter on what PR those are carried.

anyways;) we'll see what happens. I actually wanted to check the reasons for the failed CI steps in this PR to get work going again-

[oberstet]

superseded by (but preserving history) https://github.com/crossbario/crossbar/pull/2090