Database key settings: fix UI bug

Fix a bug in the database key settings dialog, where it was previously
always incorrectly applying an empty password if the password was not
changed but some other change was made (e.g. adding or removing a key
file).

src/gui/databasekey/PasswordEditWidget.cpp

@@ -62,7 +62,7 @@ bool PasswordEditWidget::isPasswordVisible() const
 
 bool PasswordEditWidget::isEmpty() const
 {
-    return visiblePage() != Page::Edit || m_compUi->enterPasswordEdit->text().isEmpty();
+    return m_compUi->enterPasswordEdit->text().isEmpty();
 }
 
 PasswordHealth::Quality PasswordEditWidget::getPasswordQuality() const

src/gui/dbsettings/DatabaseSettingsWidgetDatabaseKey.cpp

@@ -160,7 +160,9 @@ bool DatabaseSettingsWidgetDatabaseKey::saveSettings()
     }
 
     // Show warning if database password has not been set
-    if (m_passwordEditWidget->visiblePage() == KeyComponentWidget::Page::AddNew || m_passwordEditWidget->isEmpty()) {
+    if (m_passwordEditWidget->visiblePage() == KeyComponentWidget::Page::AddNew
+        || (m_passwordEditWidget->visiblePage() == KeyComponentWidget::Page::Edit && m_passwordEditWidget->isEmpty())) {
+
         QScopedPointer<QMessageBox> msgBox(new QMessageBox(this));
         msgBox->setIcon(QMessageBox::Warning);
         msgBox->setWindowTitle(tr("No password set"));
@@ -179,7 +181,7 @@ bool DatabaseSettingsWidgetDatabaseKey::saveSettings()
         return false;
     }
 
-    if (!m_passwordEditWidget->isEmpty()) {
+    if (m_passwordEditWidget->visiblePage() == KeyComponentWidget::Page::Edit && !m_passwordEditWidget->isEmpty()) {
         // Prevent setting password with a quality less than the minimum required
         auto minQuality = qBound(0, config()->get(Config::Security_DatabasePasswordMinimumQuality).toInt(), 4);
         if (m_passwordEditWidget->getPasswordQuality() < static_cast<PasswordHealth::Quality>(minQuality)) {