Fix fdo#68894 Cmis crashes on start up.

The reason of the crash is that the recent file opening
feature can't get the session automatically.

Change-Id: I6890c04cfdafc81d19c6b2b2024896df040fe091

ucb/source/ucp/cmis/cmis_content.cxx

@@ -364,6 +364,17 @@ namespace cmis
 
     libcmis::ObjectPtr Content::getObject( const uno::Reference< ucb::XCommandEnvironment >& xEnv ) throw ( libcmis::Exception )
     {
+        // can't get the session for some reason
+        // the recent file openning at start up is an example.
+        try
+        {
+            if ( !getSession( xEnv ) )
+                return m_pObject;
+        }
+        catch ( uno::RuntimeException& )
+        {
+            return m_pObject;
+        }
         if ( !m_pObject.get() )
         {
             if ( !m_sObjectId.isEmpty( ) )