mysql-workbench crashes with segmentation fault

[Karl-Philipp Richter]

`mysql-workbench` crashes with segmentation fault after entering a password for a user multiple times when default schema wasn't set before and clicking on the "Connect to database" menu item again after aborting the repeated password dialog. See attached log for details.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: mysql-workbench 6.2.3+dfsg-7build1
Uname: Linux 4.0.1-040001-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sat May 2 15:25:30 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-02 (29 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: mysql-workbench
SystemImageInfo:
 current build number: 0
 device name:
 channel: daily
 last update: Unknown
UpgradeStatus: No upgrade log present (probably fresh install)