fix(alerts): Fix broken available-actions endpoint when an installation is deleted #105302
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Fixes #105112
Fixes SENTRY-4BW1 (https://sentry.sentry.io/issues/6793528579/)
This can be reproduced by uninstalling a sentry app and then loading the alerts UI immediately afterwards. The old installation IDs for the organization remain in the cache, which causes an exception to be raised when the installation does not exist (in the
available-actionsendpoint). This adds more graceful handling for that case. The downstreamprepare_sentry_app_components()already returns None is certain cases, so it shouldn't cause any issues.It probably makes sense to invalidate the cache when installing/uninstalling, but this is a simple fix that will prevent the error for now.