Handle the case when printing result does not contain any data

Failing to do so would trigger an assert in the PDFium wrapper's
constructor.

Change-Id: Iaa53b1baa54e6483a4e7e9985ad841ac3cfef940
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/webenginewidgets/api/qwebenginepage.cpp b/src/webenginewidgets/api/qwebenginepage.cpp
index b4605ea85..82720ae3f 100644
--- a/src/webenginewidgets/api/qwebenginepage.cpp
+++ b/src/webenginewidgets/api/qwebenginepage.cpp
@@ -101,6 +101,17 @@ static const int MaxTooltipLength = 1024;
 #if defined(ENABLE_PRINTING) && defined(ENABLE_PDF)
 static bool printPdfDataOnPrinter(const QByteArray& data, QPrinter& printer)
 {
+    if (!data.size()) {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 7, 0)
+        qWarning("Failure to print on printer %ls: Print result data is empty.",
+                 qUtf16Printable(printer.printerName()));
+#else
+        qWarning("Failure to print on printer %s: Print result data is empty.",
+                 qPrintable(printer.printerName()));
+#endif
+        return false;
+    }
+
     QRect printerPageRect = printer.pageRect();
     PdfiumDocumentWrapperQt pdfiumWrapper(data.constData(), data.size(), printerPageRect.size());