Ubiquity offers to erase existing OS rather than use entire disc even when more than one disc exists

In comparison to bug #1265192 this is a minor issue but I felt I should report it anyway. I'm testing Ubuntu GNOME Utopic Beta 1 candidates and noticed with a simple two disc setup where Trusty resides on one disc and the other disc is bare I get no entire disc option but rather just erase Trusty. But the button said Continue rather than Install now so I took the bait and the next screen does offer the choice of selecting either the 160GB drive where Trusty resides or the blank 80GB drive. I'll attach a screenshot of the options offered. I did abort the operation because I'm too busy to restore my backup if things should go awry.

Here's the output of parted -l:

ubuntu-gnome@ubuntu-gnome:~$ sudo parted -l
Model: ATA WDC WD800BB-63JK (scsi)
Disk /dev/sda: 80.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags

Model: ATA WDC WD1600AABB-5 (scsi)
Disk /dev/sdb: 160GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
 1 1049kB 158GB 158GB primary ext4 boot
 2 158GB 160GB 2136MB extended
 5 158GB 160GB 2136MB logical linux-swap(v1)

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: ubiquity 2.19.2
ProcVersionSignature: Ubuntu 3.16.0-10.15-generic 3.16.1
Uname: Linux 3.16.0-10-generic i686
ApportVersion: 2.14.6-0ubuntu2
Architecture: i386
CasperVersion: 1.343
CurrentDesktop: GNOME
Date: Wed Aug 27 00:00:26 2014
InstallCmdLine: file=/cdrom/preseed/ubuntu-gnome.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha i386 (20140826)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)