Fix 3 "Possible inefficient checking"

sc/source/ui/app/scmod.cxx

@@ -2162,7 +2162,7 @@ sal_Bool  ScModule::UnregisterRefWindow( sal_uInt16 nSlotId, Window *pWnd )
 
     rlRefWindow.erase( i );
 
-    if( !rlRefWindow.size() )
+    if( rlRefWindow.empty() )
         m_mapRefWindow.erase( nSlotId );
 
     return sal_True;

sc/source/ui/view/cellsh1.cxx

@@ -1836,7 +1836,7 @@ void ScCellShell::ExecuteEdit( SfxRequest& rReq )
                                 pScMod->InputKeyEvent( KeyEvent('=',KeyCode()) );
 
                                 std::vector<rtl::OUString> aNames = pDlg->GetSelectedNames();
-                                if (aNames.size())
+                                if (!aNames.empty())
                                 {
                                     rtl::OUStringBuffer aBuffer;
                                     for (std::vector<rtl::OUString>::const_iterator itr = aNames.begin();

sc/source/ui/view/editsh.cxx

@@ -438,7 +438,7 @@ void ScEditShell::Execute( SfxRequest& rReq )
                 if ( nRet == BTN_PASTE_NAME )
                 {
                     std::vector<rtl::OUString> aNames = pDlg->GetSelectedNames();
-                    if (aNames.size())
+                    if (!aNames.empty())
                     {
                         rtl::OUStringBuffer aBuffer;
                         for (std::vector<rtl::OUString>::const_iterator itr = aNames.begin();