fix crash when switching layouts

-- the faulter was containmentinterface that was
calling containment()->applets() during view
destroying phase

app/view/containmentinterface.cpp

@@ -389,7 +389,7 @@ int ContainmentInterface::appletIdForIndex(const int index)
 
 void ContainmentInterface::deactivateApplets()
 {
-    if (!m_view->containment()) {
+    if (!m_view->containment() || !m_view->inReadyState()) {
         return;
     }
 
@@ -404,12 +404,12 @@ void ContainmentInterface::deactivateApplets()
 
 bool ContainmentInterface::appletIsExpandable(const int id)
 {
-    if (!m_view->containment()) {
+    if (!m_view->containment() || !m_view->inReadyState()) {
         return false;
     }
 
     for (const auto applet : m_view->containment()->applets()) {
-        if (applet->id() == (uint)id) {
+        if (applet && applet->id() == (uint)id) {
             if (m_view->layout() && m_view->layout()->isInternalContainment(applet)) {
                 return true;
             }
@@ -427,7 +427,7 @@ bool ContainmentInterface::appletIsExpandable(const int id)
 
 bool ContainmentInterface::appletIsExpandable(PlasmaQuick::AppletQuickItem *appletQuickItem)
 {
-    if (!appletQuickItem) {
+    if (!appletQuickItem || !m_view->inReadyState()) {
         return false;
     }
 
@@ -499,7 +499,7 @@ bool ContainmentInterface::appletIsExpanded(const int id)
 
 void ContainmentInterface::toggleAppletExpanded(const int id)
 {
-    if (!m_view->containment()) {
+    if (!m_view->containment() || !m_view->inReadyState()) {
         return;
     }
 

app/view/view.cpp

@@ -318,6 +318,11 @@ bool View::inDelete() const
     return m_inDelete;
 }
 
+bool View::inReadyState() const
+{
+    return (m_layout != nullptr);
+}
+
 void View::disconnectSensitiveSignals()
 {
     m_initLayoutTimer.stop();

app/view/view.h

@@ -140,6 +140,7 @@ public:
     void setAlternativesIsShown(bool show);
 
     bool inDelete() const;
+    bool inReadyState() const;
 
     bool onPrimary() const;
     void setOnPrimary(bool flag);