Bug 364785

Discover crash when searching for an application

Reproducible: Always

Steps to Reproduce:
1. Start discover
2. Click on the search field
3. Type the application name

Actual Results:  
Crash

Expected Results:  
It should not crash.

GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/plasma-discover...(no debugging symbols found)...done.
Attaching to program: /usr/bin/plasma-discover, process 2057
Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
(gdb) run
Starting program: /usr/bin/plasma-discover 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe7513700 (LWP 2130)]
[New Thread 0x7fffdebdd700 (LWP 2131)]
[New Thread 0x7fffdd9cc700 (LWP 2132)]
[New Thread 0x7fffd553f700 (LWP 2133)]
The file  "/home/lucas/.local/share/knewstuff3/.knsregistry"  could not be opened.
The file  "/home/lucas/.local/share/knewstuff3/.knsregistry"  could not be opened.
The file  "/home/lucas/.local/share/knewstuff3/.knsregistry"  could not be opened.
no packages for "UEFI Updates"
no packages for "Rival SteelSeries"
no packages for "VL812 Firmware"
no packages for "VL811 Firmware"
no packages for "VL811+ Firmware"
no packages for "VL812 B2 Firmware"
needed... 1515
[New Thread 0x7fffc7b6a700 (LWP 2138)]
[New Thread 0x7fffc663e700 (LWP 2139)]
[New Thread 0x7fffc5e3d700 (LWP 2140)]
[New Thread 0x7fffc4e20700 (LWP 2141)]
The wallet service was disabled by the user
Pass a valid window to KWallet::Wallet::openWallet().
User disabled the wallet system so returning 0 here.
Pass a valid window to KWallet::Wallet::openWallet().
User disabled the wallet system so returning 0 here.
Pass a valid window to KWallet::Wallet::openWallet().
User disabled the wallet system so returning 0 here.
qml: application  krita.desktop  not found
qml: application  kdevelop.desktop  not found
Pass a valid window to KWallet::Wallet::openWallet().
User disabled the wallet system so returning 0 here.
qml: application  krita.desktop  not found
qml: application  kdevelop.desktop  not found

Thread 1 "plasma-discover" received signal SIGSEGV, Segmentation fault.
0x00007fffc8d822a8 in KNS3::Entry::size() const ()
   from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
(gdb)