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Message filtering did not account for message with only attachments

See original GitHub issue

There was a mute issued to an user after posting 5 messages with 5 attachments. The bot issued a mute and treated accordingly against message spamming behaviour, however in this case there are two problems:

They were messages with empty message contents, only attachments.
The attachments were completely deleted, and there is no way to know what they were.

The log of the case looks like this

Deleted by: Python#4329
Date: Oct. 23, 2019, 6:54 a.m.
A̷k̴a̴s̵h̶#4646Oct. 23, 2019, 6:54 a.m. | User ID: 330256174098284554
A̷k̴a̴s̵h̶#4646Oct. 23, 2019, 6:54 a.m. | User ID: 330256174098284554
A̷k̴a̴s̵h̶#4646Oct. 23, 2019, 6:54 a.m. | User ID: 330256174098284554
A̷k̴a̴s̵h̶#4646Oct. 23, 2019, 6:54 a.m. | User ID: 330256174098284554
A̷k̴a̴s̵h̶#4646Oct. 23, 2019, 6:54 a.m. | User ID: 330256174098284554

The following codes might be of interest:

    """Detects duplicated messages sent by a single user."""
    relevant_messages = tuple(
        msg
        for msg in recent_messages
        if (
            msg.author == last_message.author
            and msg.content == last_message.content
        )
    )

    total_duplicated = len(relevant_messages)

    if total_duplicated > config['max']:
        ...

Which is in duplicates.py