tdf#91378-Empty Custom Properties are lost while saving in .pptx format

Conflicts:
	sd/qa/unit/export-tests.cxx
Reviewed on:
	https://gerrit.libreoffice.org/15966

Change-Id: Ibc24ab9633b51fe41ad483121646cc391319fe6f

oox/source/core/xmlfilterbase.cxx

@@ -539,8 +539,6 @@ OUString XmlFilterBase::addRelation( const Reference< XOutputStream >& rOutputSt
 static void
 writeElement( FSHelperPtr pDoc, sal_Int32 nXmlElement, const OUString& sValue )
 {
-    if( sValue.isEmpty() )
-        return;
     pDoc->startElement( nXmlElement, FSEND );
     pDoc->writeEscaped( sValue );
     pDoc->endElement( nXmlElement );
@@ -745,10 +743,6 @@ writeCustomProperties( XmlFilterBase& rSelf, Reference< XDocumentProperties > xP
     {
         if ( !aprop[n].Name.isEmpty() )
         {
-            // Ignore empty string property as well.
-            if (aprop[n].Value.has<OUString>() && aprop[n].Value.get<OUString>().isEmpty())
-                continue;
-
             OString aName = OUStringToOString( aprop[n].Name, RTL_TEXTENCODING_ASCII_US );
             // pid starts from 2 not from 1 as MS supports pid from 2
             pAppProps->startElement( XML_property ,

sax/source/fastparser/fastparser.cxx

@@ -1037,8 +1037,7 @@ void FastSaxParserImpl::parse()
 void FastSaxParserImpl::callbackStartElement(const xmlChar *localName , const xmlChar* prefix, const xmlChar* URI,
     int numNamespaces, const xmlChar** namespaces, int numAttributes, int /*defaultedAttributes*/, const xmlChar **attributes)
 {
-    if( !pendingCharacters.isEmpty())
-        sendPendingCharacters();
+    sendPendingCharacters();
     Entity& rEntity = getEntity();
     if( rEntity.maNamespaceCount.empty() )
     {
@@ -1145,8 +1144,7 @@ void FastSaxParserImpl::callbackStartElement(const xmlChar *localName , const xm
 
 void FastSaxParserImpl::callbackEndElement( const xmlChar*, const xmlChar*, const xmlChar* )
 {
-    if( !pendingCharacters.isEmpty())
-        sendPendingCharacters();
+    sendPendingCharacters();
     Entity& rEntity = getEntity();
     SAL_WARN_IF(rEntity.maNamespaceCount.empty(), "sax", "Empty NamespaceCount");
     if( !rEntity.maNamespaceCount.empty() )

sd/qa/unit/export-tests.cxx

@@ -122,6 +122,7 @@ public:
     void testTransparentBackground();
 
     void testFdo90607();
+    void testTdf91378();
 #if !defined WNT
     void testBnc822341();
 #endif
@@ -155,6 +156,7 @@ public:
     CPPUNIT_TEST(testBulletMarginAndIndentation);
     CPPUNIT_TEST(testParaMarginAndindentation);
     CPPUNIT_TEST(testTransparentBackground);
+    CPPUNIT_TEST(testTdf91378);
 
 #if !defined WNT
     CPPUNIT_TEST(testBnc822341);
@@ -951,6 +953,26 @@ void SdExportTest::testBulletColor()
     CPPUNIT_ASSERT_EQUAL_MESSAGE( "Bullet's color is wrong!", sal_uInt32(0xff0000),pNumFmt->GetNumRule()->GetLevel(0).GetBulletColor().GetColor());
 }
 
+void SdExportTest::testTdf91378()
+{
+
+    //Check For Import and Export Both
+    ::sd::DrawDocShellRef xDocShRef = loadURL(getURLFromSrc("/sd/qa/unit/data/pptx/tdf91378.pptx"), PPTX);
+    for( sal_uInt32 i=0;i<2;i++)
+    {
+      SdDrawDocument *pDoc = xDocShRef->GetDoc();
+      CPPUNIT_ASSERT_MESSAGE( "no document", pDoc != NULL );
+      uno::Reference<document::XDocumentPropertiesSupplier> xDocumentPropertiesSupplier( xDocShRef->GetModel(), uno::UNO_QUERY );
+      uno::Reference<document::XDocumentProperties> xProps( xDocumentPropertiesSupplier->getDocumentProperties(), uno::UNO_QUERY );
+      uno::Reference<beans::XPropertySet> xUDProps( xProps->getUserDefinedProperties(), uno::UNO_QUERY );
+      OUString propValue;
+      xUDProps->getPropertyValue(OUString("Testing")) >>= propValue;
+      CPPUNIT_ASSERT(propValue.isEmpty());
+      xDocShRef = saveAndReload( xDocShRef, PPTX );
+    }
+    xDocShRef->DoClose();
+}
+
 #if !defined WNT
 
 void SdExportTest::testBnc822341()