tdf#114848 Don't save empty themes

Change-Id: I7136f5c0bc884a2f9ea945b4e0bc093a5ef2d8df
Reviewed-on: https://gerrit.libreoffice.org/47481Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>

sd/qa/unit/export-tests-ooxml2.cxx

@@ -123,6 +123,7 @@ public:
     void testGroupsPosition();
     void testGroupsRotatedPosition();
     void testAccentColor();
+    void testTdf114848();
     void testTdf68759();
     void testTdf90626();
 
@@ -173,6 +174,7 @@ public:
     CPPUNIT_TEST(testGroupsPosition);
     CPPUNIT_TEST(testGroupsRotatedPosition);
     CPPUNIT_TEST(testAccentColor);
+    CPPUNIT_TEST(testTdf114848);
     CPPUNIT_TEST(testTdf68759);
     CPPUNIT_TEST(testTdf90626);
 
@@ -1304,6 +1306,19 @@ void SdOOXMLExportTest2::testAccentColor()
     assertXPath(pXmlDocTheme2, "/a:theme/a:themeElements/a:clrScheme/a:accent6/a:srgbClr", "val", "deb340");
 }
 
+void SdOOXMLExportTest2::testTdf114848()
+{
+    ::sd::DrawDocShellRef xDocShRef = loadURL(m_directories.getURLFromSrc("sd/qa/unit/data/pptx/tdf114848.pptx"), PPTX);
+    utl::TempFile tempFile;
+    xDocShRef = saveAndReload(xDocShRef.get(), PPTX, &tempFile);
+    xDocShRef->DoClose();
+
+    xmlDocPtr pXmlDocTheme1 = parseExport(tempFile, "ppt/theme/theme1.xml");
+    assertXPath(pXmlDocTheme1, "/a:theme/a:themeElements/a:clrScheme/a:dk2/a:srgbClr", "val", "1f497d");
+    xmlDocPtr pXmlDocTheme2 = parseExport(tempFile, "ppt/theme/theme2.xml");
+    assertXPath(pXmlDocTheme2, "/a:theme/a:themeElements/a:clrScheme/a:dk2/a:srgbClr", "val", "1f497d");
+}
+
 void SdOOXMLExportTest2::testTdf68759()
 {
     ::sd::DrawDocShellRef xDocShRef = loadURL(m_directories.getURLFromSrc("sd/qa/unit/data/odp/tdf68759.odp"), ODP);

sd/source/filter/eppt/pptx-epptooxml.cxx

@@ -2604,6 +2604,9 @@ bool PowerPointExport::WriteColorSchemes(FSHelperPtr pFS, const OUString& rTheme
 
                 aGrabBag.getValue(rThemePath) >>= aCurrentTheme;
 
+                if (!aCurrentTheme.getLength())
+                    return false;
+
                 // Order is important
                 for (int nId = PredefinedClrSchemeId::dk2; nId != PredefinedClrSchemeId::Count; nId++)
                 {