kcm/componentchooser: fix crash when no applications installed

BUG: 431651

kcms/componentchooser/componentchooser.cpp

@@ -99,7 +99,7 @@ void ComponentChooser::load()
 
 void ComponentChooser::select(int index)
 {
-    if (m_index == index) {
+    if (m_index == index && m_applications.size() != 1) {
         return;
     }
     if (index == m_applications.length() - 1) {

kcms/componentchooser/componentchooser.h

@@ -58,7 +58,7 @@ Q_SIGNALS:
 
 protected:
     QVariantList m_applications;
-    int m_index;
+    int m_index = -1;
     std::optional<int> m_defaultIndex;
     QString m_mimeType;
     QString m_type;