#i126367 existing command text is repeated when insert formula

Patch by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>

git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1685665 13f79535-47bb-0310-9956-ffa450edef68
(cherry picked from commit 7db8e69)

main/starmath/source/mathmlimport.cxx

@@ -577,12 +577,10 @@ void SmXMLImport::endDocument(void)
             pDocShell->SetFormulaTree(pTree);
             if (0 == aText.Len())  //If we picked up no annotation text
             {
-                //Make up some editable text
-                aText = pDocShell->GetText();
+                // Get text from imported formula
                 pTree->CreateTextFromNode(aText);
                 aText.EraseTrailingChars();
             }
-            pDocShell->SetText( String() );
 
             // Convert symbol names
             SmParser &rParser = pDocShell->GetParser();