Before this commit, when the user creates a private task
and assign another user to that task and then removes
himself and save the task, the current user should no
longer access to that task since the task becomes this
private task of the other user assigned on it.
So when the current user changes anything in that task,
it will have a `Access Error`.
However if the user tries to remove a follower on that
task he will also have a traceback because no thread is found.
The reason why no thread is found is because the user has
no longer access to the record and so he has no longer
access to the chatter.
This commit checks if a thread is found before continuing
the process. If no thread is found then the user has no
access to the chatter instead of throwing a traceback
because no thread is found.
task-2857229
closesodoo/odoo#94665
X-original-commit: 2c68e397b3c12657024e70016808183c89260168
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>
Co-authored-by: Prakash Prajapati <ppr@odoo.com>
