Fix warning on launch "QPixmap::scaled: Pixmap is a null pixmap"

If Dolphin is launched with the information panel on and set to display
previews, PixmapViewer::paintEvent is called three times before any
pixmap is set. Each time the above warning message is output.

REVIEW: 119553
FIXED-IN: 4.14.0

1 files changed, 7 insertions, 5 deletions

diff --git a/src/panels/information/pixmapviewer.cpp b/src/panels/information/pixmapviewer.cpp
index 8a752c587..45a8c17e2 100644
--- a/src/panels/information/pixmapviewer.cpp
+++ b/src/panels/information/pixmapviewer.cpp
@@ -102,11 +102,13 @@ void PixmapViewer::paintEvent(QPaintEvent* event)
         const bool useOldPixmap = (m_transition == SizeTransition) &&
                                   (m_oldPixmap.width() > m_pixmap.width());
         const QPixmap& largePixmap = useOldPixmap ? m_oldPixmap : m_pixmap;
-        const QPixmap scaledPixmap = largePixmap.scaled(scaledWidth,
-                                                        scaledHeight,
-                                                        Qt::IgnoreAspectRatio,
-                                                        Qt::FastTransformation);
-        painter.drawPixmap(x, y, scaledPixmap);
+	if (!largePixmap.isNull()) {
+            const QPixmap scaledPixmap = largePixmap.scaled(scaledWidth,
+                                                            scaledHeight,
+                                                            Qt::IgnoreAspectRatio,
+                                                            Qt::FastTransformation);
+            painter.drawPixmap(x, y, scaledPixmap);
+	}
     } else {
         const int x = (width()  - m_pixmap.width() ) / 2;
         const int y = (height() - m_pixmap.height()) / 2;