TSCP: remove invalid signatures on saving

Change-Id: Ib2bc309966e802eb584fa3c6e37458b840710e81
Reviewed-on: https://gerrit.libreoffice.org/43111Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>

sw/source/uibase/app/docsh.cxx

@@ -467,10 +467,15 @@ bool SwDocShell::SaveAs( SfxMedium& rMedium )
             m_xDoc->SetContainsMSVBasic( false );
         }
 
-        // End TableBox Edit!
         if (m_pWrtShell)
+        {
+            // End TableBox Edit!
             m_pWrtShell->EndAllTableBoxEdit();
 
+            // Remove invalid signatures.
+            m_pWrtShell->ValidateParagraphSignatures(false);
+        }
+
         // Remember and preserve Modified-Flag without calling the Link
         // (for OLE; after Statement from MM)
         const bool bIsModified = m_xDoc->getIDocumentState().IsModified();