Description of problem:

On a unregistered system , wait for the rhsm-icon to appear. Click on the "Register Now" icon , complete the registration process you will observe a full crash report email on the system 

Version-Release number of selected component (if applicable):

subscription-manager: 1.15.9-14.el7
python-rhsm: 1.15.4-5.el7

How reproducible:
3/3

Steps to Reproduce:
1.Click on "register now" icon 
2.Complete the register process from the GUI, ( with auto-attach)
3.After completing the registration process and crash report appeared on the machine

[root@dhcp35-172 ~]# mail
Heirloom Mail version 12.5 7/5/10.  Type ? for help.
"/var/spool/mail/root": 4 messages
>   1 user.e  Fri Oct  9 13:02  81/2650  "[abrt] full crash report"
    2 user.e  Fri Oct  9 13:05  81/2650  "[abrt] full crash report"
    3 user.e  Fri Oct  9 13:29  81/2650  "[abrt] full crash report"
    4 user.e  Fri Oct  9 14:06  81/2650  "[abrt] full crash report"
& 4
Message  4:
From user.eng.blr.redhat.com  Fri Oct  9 14:06:00 2015
Return-Path: <user.eng.blr.redhat.com>
X-Original-To: root@localhost
Delivered-To: root.eng.blr.redhat.com
Date: Fri, 09 Oct 2015 14:05:59 +0530
From: user.eng.blr.redhat.com
To: root.eng.blr.redhat.com
Subject: [abrt] full crash report
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
Status: RO

time:           Fri 09 Oct 2015 01:02:18 PM IST
cmdline:        /usr/bin/python /usr/sbin/subscription-manager-gui --register
uid:            0 (root)
abrt_version:   2.1.11
event_log:      
executable:     /usr/sbin/subscription-manager-gui
hostname:       dhcp35-172.lab.eng.blr.redhat.com
kernel:         3.10.0-322.el7.x86_64
last_occurrence: 1444379758
pid:            25926
pkg_arch:       x86_64
pkg_epoch:      0
pkg_name:       subscription-manager-gui
pkg_release:    14.el7
pkg_version:    1.15.9
runlevel:       N 5
username:       root

backtrace:
:managergui.py:373:_on_dialog_destroy:AttributeError: 'NoneType' object has no attribute 'set_sensitive'
:
:Traceback (most recent call last):
:  File "/usr/share/rhsm/subscription_manager/gui/managergui.py", line 373, in _on_dialog_destroy
:    widget.set_sensitive(True)
:AttributeError: 'NoneType' object has no attribute 'set_sensitive'
:
:Local variables in innermost frame:
:widget: None
:obj: <Dialog object at 0x245cf00 (GtkDialog at 0x24acfa0)>
:self: <MainWindow object at 0x1bade10 (subscription_manager+gui+managergui+MainWindow at 0x135ce60)>

environ:
:LANG=en_US.UTF-8
:USERHELPER_UID=1000
:TERM=dumb
:SHELL=/bin/bash
:XAUTHORITY=/root/.xauthYvDGGF
:LOGNAME=root
:USER=root
:HOME=/root
:PATH=/usr/sbin:/usr/bin:/sbin:/bin:/root/bin
:DISPLAY=:0

machineid:
:systemd=2b51ad823bed0e0aeb1a8759be61737e
:sosreport_uploader-dmidecode=75b1613aa9a57cff6e0dfdd68a49568073396b7435176835f419009f4ea8a1d7

os_info:
:NAME="Red Hat Enterprise Linux Server"
:VERSION="7.2 (Maipo)"
:ID="rhel"
:ID_LIKE="fedora"
:VERSION_ID="7.2"
:PRETTY_NAME=OpenShift
:ANSI_COLOR="0;31"
:CPE_NAME="cpe:/o:redhat:enterprise_linux:7.2:beta:server"
:HOME_URL="https://www.redhat.com/"
:BUG_REPORT_URL="https://bugzilla.redhat.com/"
:
:REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 7"
:REDHAT_BUGZILLA_PRODUCT_VERSION=7.2
:REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
:REDHAT_SUPPORT_PRODUCT_VERSION="7.2 Beta"


Actual results:
Observed above mentioned crash report

Expected results:
there shouldnt be any crash report on the system
Additional info: