Reproducible LaunchBox crash on empty pad closure.

[kallisti5]

Reproduction steps:

1) Launch LaunchBox
2) right-click on LaunchBox and select Pad >> New
3) quickly click close box on newly created pad
4) quickly press 'close' button
5) CRASH

backtrace to follow.

tested on hrev37609 gcc4-hybrid

[kallisti5]

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[tcsetpgrp failed in terminal_inferior: Invalid Argument]
Thread 2853 caused an exception: Segment violation
Reading symbols from /boot/system/runtime_loader...done.
Loaded symbols for /boot/system/runtime_loader
Reading symbols from /boot/system/lib/libbe.so...done.
Loaded symbols for /boot/system/lib/libbe.so
Reading symbols from /boot/system/lib/libtranslation.so...done.
Loaded symbols for /boot/system/lib/libtranslation.so
Reading symbols from /boot/system/lib/libsupc++.so...done.
Loaded symbols for /boot/system/lib/libsupc++.so
Reading symbols from /boot/system/lib/libroot.so...done.
Loaded symbols for /boot/system/lib/libroot.so
Reading symbols from /boot/system/lib/libstdc++.so...done.
Loaded symbols for /boot/system/lib/libstdc++.so
Reading symbols from /boot/system/lib/libtextencoding.so...done.
Loaded symbols for /boot/system/lib/libtextencoding.so
[tcsetpgrp failed in terminal_inferior: Invalid Argument]
[Switching to team /boot/system/apps/LaunchBox (2853) thread LaunchBox (2853)]
0x002cf54d in BMessage::AddData () from /boot/system/lib/libbe.so
(gdb) bt
#0  0x002cf54d in BMessage::AddData () from /boot/system/lib/libbe.so
#1  0x002cfd6e in BMessage::AddPoint () from /boot/system/lib/libbe.so
#2  0x00210f45 in MainWindow::SaveSettings ()
#3  0x0020afea in App::_StoreSettingsIfNeeded ()
#4  0x0020b079 in App::Pulse ()
#5  0x002c07f1 in BApplication::DispatchMessage ()
   from /boot/system/lib/libbe.so
#6  0x002cb184 in BLooper::task_looper () from /boot/system/lib/libbe.so
#7  0x002c0d74 in BApplication::Run () from /boot/system/lib/libbe.so
#8  0x002104b8 in main ()
(gdb) 

[stpere]

Should be fixed in hrev45003. Thanks!