tdf#96250 desktop: empty str is the same as 0 str in jsonToPropertyValues()

Change-Id: I77306dc998afc53bb1d5710a8d1ae68717f945d1
(cherry picked from commit 5cc574fe)

desktop/source/lib/init.cxx

@@ -264,7 +264,7 @@ static OUString getAbsoluteURL(const char* pURL)
 static void jsonToPropertyValues(const char* pJSON, uno::Sequence<beans::PropertyValue>& rPropertyValues)
 {
     std::vector<beans::PropertyValue> aArguments;
-    if (pJSON)
+    if (pJSON && pJSON[0] != '\0')
     {
         boost::property_tree::ptree aTree;
         std::stringstream aStream(pJSON);