MacOS – Can’t delete empty partition

I've searched around on here and viewed posts such as:

• I deleted my Bootcamp partition but can't resize my OS X partition
• Can't ever remove partition?

The second one looked most promising, however the solution doesn't seem to give me the empty partition when running diskutil cs list so I can't delete it this way:

diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 2BBFD1F3-XXXX-XXXX-XXXX-XXXXXXXXXXXX
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         447653191680 B (447.7 GB)
    Free Space:   106496 B (106.5 KB)
    |
    +-< Physical Volume F3D5C9AC-XXXX-XXXX-XXXX-XXXXXXXXXXXX
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     447653191680 B (447.7 GB)
    |
    +-> Logical Volume Family FCEE4713-XXXX-XXXX-XXXX-XXXXXXXXXXXX
        ----------------------------------------------------------
        Encryption Status:       Unlocked
        Encryption Type:         AES-XTS
        Conversion Status:       Complete
        Conversion Direction:    -none-
        Has Encrypted Extents:   Yes
        Fully Secure:            Yes
        Passphrase Required:     Yes
        |
        +-> Logical Volume C6735B8F-XXXX-XXXX-XXXX-XXXXXXXXXXXX
            ---------------------------------------------------
            Disk:                  disk1
            Status:                Online
            Size (Total):          447300763648 B (447.3 GB)
            Conversion Progress:   -none-
            Revertible:            Yes (unlock and decryption required)
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS

This is what Disk Utility gives me:

As you can see the delete button is unavailable.

I have a Time Machine backup but that only gave me the option to restore to my 447GB disk (the drive is obviously a 500GB).

What are the recommended steps to reclaim my free space? I've tried repairing, and it found some errors in the partition table and supposedly "fixed" them. The situation came about when I created a blank partition and an error was shown. I've since then being trying to delete it with no luck.