BUG: Fix null d_ptr in alternate ctkMessageBox constructor #1306
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Initialize d_ptr in the alternative ctkMessageBox constructor before
calling d->init(), preventing a potential null dereference crash and
addressing the compiler warning.
Fixes the following warning;
```
/path/to/CTK/Libs/Widgets/ctkMessageBox.cpp: In constructor ‘ctkMessageBox::ctkMessageBox(QMessageBox::Icon, const QString&, const QString&, QMessageBox::StandardButtons, QWidget*, Qt::WindowFlags)’:
/path/to/CTK/Libs/Widgets/ctkMessageBox.cpp:194:10: warning: ‘this’ pointer is null [-Wnonnull]
194 | d->init();
| ~~~~~~~^~
```
This was referenced Nov 9, 2025
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Initialize d_ptr in the alternative ctkMessageBox constructor before calling d->init(), preventing a potential null dereference crash and addressing the compiler warning.
Fixes the following warning;