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We would receive a KeyError for jids we dont have in the roster,
now we skip them and print a warning.

Fixes #173

This is due a update to ejabbered where Nodes
can now hold 10 items per default

This is only a BytesIO Object in memory, its becomes garbage collected
after the method ends anyway

Fixes #232

Support 12bit IVs on encrypted httpupload files

[plugin_installer] do not update plugin if it's not compatible with current Gajim version. Fixes #225

[omemo] Reword the manifest.ini description

Closes #224

See merge request !40

- Print only warning instead of error, as the module is only optional
- Log the error to the debug log, so users dont think we didnt catch the exception

The oob tag is only added when a body tag exists with the same content. (means not unencrypted)
If any encryption plugin is active, there should be no cleartext body.
So no oob tag is added to encrypted messages.

This patch exists only for the OTR plugin.

This will only be added on not encrypted Messages