Crash when tab is closed during ping

[GomesGoncalo]

Hi,

I compiled the code from the develop branch and launched the app.
It is crashing when I start pinging and close the tab (Always reproducible)

The issue is that newEditor is being dereferenced while being nullptr

Thread 1 "Pingnoo" received signal SIGSEGV, Segmentation fault.

0x00007fffc835789c in QtPrivate::QFunctorSlotObject<Nedrysoft::Core::EditorManager::EditorManager(Nedrysoft::Core::EditorManagerTabWidget*)::{lambda(int)#1}, 1, QtPrivate::List<int>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) () from /home/ggomes/Documents/pingnoo/bin/x86_64/Release/Components/libCore.so

[GomesGoncalo]

Fixed by #101

Don't know if this is the right way of progressing the issue, I think GitHub is supposed to have commit actions which I might have missed, anyway, this has been merged!