autopilot3 crashed with FileNotFoundError in _execute_child(): [Errno 2] No such file or directory: 'spreadsheet'

autopilot3 launch <executable> crashes if executable exists but is not in path.

TEST CASE
1. cp /usr/bin/gedit /tmp/mygedit
2. cd /tmp/
3. autopilot3 launch mygedit

ACTUAL RESULT
This crash

EXPECTED RESULT
autopilot fails nicely with something like:
Error: Cannot find application in PATH 'mygedit'

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: python3-autopilot 1.5.0+14.10.20140509-0ubuntu1 [modified: usr/lib/python3/dist-packages/autopilot/introspection/_search.py]
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.2-0ubuntu4
Architecture: amd64
CrashCounter: 1
CurrentDesktop: Unity
Date: Thu May 22 16:07:18 2014
ExecutablePath: /usr/bin/autopilot3
InstallationDate: Installed on 2013-09-03 (260 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130902)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/autopilot3 launch spreadsheet
PythonArgs: ['/usr/bin/autopilot3', 'launch', 'spreadsheet']
SourcePackage: autopilot
Title: autopilot3 crashed with FileNotFoundError in _execute_child(): [Errno 2] No such file or directory: 'spreadsheet'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm autopilot cdrom dip libvirtd lpadmin plugdev sambashare sudo