Database: Fix crash on actor faceset or charset selection

If the faceset selection or charset selection had been called while
no actor was selected, the editor crashed. This is fixed now.

src/ui/database/actor_widget.cpp

@@ -353,6 +353,10 @@ void ActorWidget::resizeEvent(QResizeEvent *event)
 }
 
 void ActorWidget::faceSetClicked() {
+	if (!m_current) {
+		return;
+	}
+
 	auto* widget = new PickerFacesetWidget(m_current->face_index, this);
 	PickerDialog dialog(m_project, FileFinder::FileType::Image, widget, this);
 	QObject::connect(&dialog, &PickerDialog::fileSelected, [&](const QString& baseName) {
@@ -365,6 +369,10 @@ void ActorWidget::faceSetClicked() {
 }
 
 void ActorWidget::charSetClicked() {
+	if (!m_current) {
+		return;
+	}
+
 	auto* widget = new PickerCharsetWidget(m_current->character_index, this);
 	PickerDialog dialog(m_project, FileFinder::FileType::Image, widget, this);
 	QObject::connect(&dialog, &PickerDialog::fileSelected, [&](const QString& baseName) {