mod_c2s_limit_sessions: Fix check when it's the first connection Creation of the sessions[username] entry happens after the "pre-resource-bind" event, before the "resource-bind" event. Thus, for a users first connection, it may not exist. This led to an 'attempt to index a nil value' error, fixed here.

---
labels:
- 'Stage-Obsolete'
---

::: {.alert .alert-warning}
As of Prosody 0.12.x, `prosodyctl shell user list HOST` can be used
instead of this module.
:::

This module adds a command to `prosodyctl` for listing users.

``` sh
prosodyctl mod_listusers
```