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
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