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mod_bookmarks2: Fix handling of nick and password elements This form of child retrieval fails when the stanza elements internally don't have an 'xmlns' attribute, which can happen sometimes for some reason, including when they have been constructed via the stanza builder API. When that is the case then the explicit namespace arguemnt does not match the nil value of the internal attribute. Calling `:get_child()` without the namespace argument does the right thing here, with both nil and the parent namespace as valid values for the internal attribute.

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summary: Prevent unaffiliated MUC participants from sending PMs
---

# Introduction

This module prevents unaffiliated users from sending private messages in
chat rooms, unless someone with an affiliation (member, admin etc)
messages them first.

# Configuration

The module doesn't have any options, just load it onto a MUC component.

``` lua
Component "muc"
modules_enabled = {
    "muc_block_pm";
}
```

# Compatibility

    Branch State
  -------- -----------------
       0.9 Works
      0.10 Should work
      0.11 Should work