Public bug reported:

To reproduce
1. Start htop
2. Filter processes, so that list of processes will be empty: press F4, enter 
random string until list of processes will be empty (e.g. "sdfkjsdkjfhiw"), 
press enter.
3. Press PageDown.

Expected behaviour: nothing should happen.
Observed behaiour: htop crashes with following output.


htop 1.0.2 aborting. Please report bug at http://htop.sf.net

 Please include in your report the following backtrace: 
htop[0x4098f7]
/lib/x86_64-linux-gnu/libc.so.6(+0x36ff0)[0x7fde7403dff0]
htop(Panel_draw+0x2a7)[0x40df87]
htop(main+0x724)[0x405b84]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7fde74028de5]
htop[0x407db1]

Additionally, in order to make the above backtrace useful,
please also run the following command to generate a disassembly of your binary:

   objdump -d `which htop` > ~/htop.objdump

and then attach the file ~/htop.objdump to your bug report.

Thank you for helping to improve htop!

Aborted (core dumped)

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: htop 1.0.2-2
ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
Uname: Linux 3.11.0-15-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
CheckboxSubmission: 3d16077c4fdd6a017d47f6e3dc4f3c54
CheckboxSystem: b633b4f40868d491c2ae5b50030ce6f3
Date: Thu Jan  9 00:51:50 2014
ExecutablePath: /usr/bin/htop
ExecutableTimestamp: 1372547641
InstallationDate: Installed on 2014-01-01 (7 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
ProcCmdline: htop
ProcCwd: /var/crash
Signal: 6
SourcePackage: htop
StacktraceTop:
 Panel_draw (this=this@entry=0x2370f50, focus=focus@entry=true) at Panel.c:296
 main (argc=<optimized out>, argv=<optimized out>) at htop.c:503
Title: htop crashed with SIGABRT in Panel_draw()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: htop (Ubuntu)
     Importance: Medium
         Status: New


** Tags: amd64 apport-crash saucy

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1267251

Title:
  SIGABRT in Panel_draw() when pressing PageDown with empty (filtered)
  process list

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