removing swap partition does not remove entry from /etc/fstab

I used gnome-disk-utility to deactivate the swap partition. I then used it to delete the swap partition. Both operations seem to have worked in gnome-disk-utility however it is not clear that the free space size increased correspondingly. The entry for the swap partition in /etc/fstab remained and still pointed to the partition that was deleted in gnome-disk-utility.

The expected behavior is that when a swap partition is deleted in gnome-disk-utility the corresponding /etc/fstab entry should also be removed.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-disk-utility 3.18.3.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
Uname: Linux 4.4.0-24-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Jun 20 22:08:50 2016
EcryptfsInUse: Yes
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-disk-utility
UpgradeStatus: No upgrade log present (probably fresh install)