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

include/wx/propgrid/props.h

@@ -997,7 +997,7 @@ public:
     void SetCustomButton( const wxString& custBtText,
                           wxArrayStringProperty* pcc )
     {
-        if ( custBtText.length() )
+        if ( !custBtText.empty() )
         {
             EnableCustomNewAction();
             m_pCallingClass = pcc;