Use wxString's empty() when checking if the string is (non-)empty throughout wx.

Instead of constructs such as if "( s.length() )" and "if (s.length() > 0)" use "if ( !s.empty() )" instead. Similarly for "if (s.length() == 0)" or "if ( s.IsNull() )", use "if ( s.empty() )".
No code changes intended except for a few instances where a construct like "if ( s.length() && wxFileExists(s) )" was changed to not check the length of the string and let wxFileExists handle such cases.



git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66728 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/widgets/bmpcombobox.cpp

@@ -884,7 +884,7 @@ wxBitmap BitmapComboBoxWidgetsPage::QueryBitmap(wxString* pStr)
 
     ::wxSetCursor( *wxHOURGLASS_CURSOR );
 
-    if ( filepath.length() )
+    if ( !filepath.empty() )
     {
         if ( pStr )
         {