Error handling for printPdf

qmlprinter.cpp

@@ -23,6 +23,10 @@ void QmlPrinter::changePrinterOrientation(QPrinter &printer, const int &width,
 }
 
 bool QmlPrinter::printPdf(const QString &location, QQuickItem *presentation) {
+    if (!presentation) {
+        return false;
+    }
+
   QVector<QQuickItem *> slides, masterSlideElements;
   presentation->setProperty(
       "allowDelay",
@@ -38,6 +42,7 @@ bool QmlPrinter::printPdf(const QString &location, QQuickItem *presentation) {
   }
 
   if (slides.length() == 0) {
+      qCWarning(lc) << QObject::tr("No pages in %1, no PDF produced!").arg(location);
     return false;
   }
 
@@ -141,6 +146,7 @@ void QmlPrinter::paintItem(QQuickItem *item, QQuickWindow *window,
       drawChildren = false;
     }
   }
+
   if (drawChildren) {
 
     auto items = item->childItems();