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

utils/wxrc/wxrc.cpp

@@ -140,7 +140,7 @@ public:
         {
             const XRCWidgetData& w = m_wdata.Item(i);
             if( !CanBeUsedWithXRCCTRL(w.GetClass()) ) continue;
-            if( w.GetName().Length() == 0 ) continue;
+            if( w.GetName().empty() ) continue;
             file.Write(
                 wxT(" ") + w.GetClass() + wxT("* ") + w.GetName()
                 + wxT(";\n"));
@@ -155,7 +155,7 @@ public:
         {
             const XRCWidgetData& w = m_wdata.Item(i);
             if( !CanBeUsedWithXRCCTRL(w.GetClass()) ) continue;
-            if( w.GetName().Length() == 0 ) continue;
+            if( w.GetName().empty() ) continue;
             file.Write( wxT("  ")
                         + w.GetName()
                         + wxT(" = XRCCTRL(*this,\"")