Replace wxComboBox::IsEmpty() with Is{List,Text}Empty().

IsEmpty() didn't exist in all ports (notably not wxMSW) and its meaning was
unclear anyhow, so remove it even from the ports where it did exist and add
clear Is{List,Text}Empty() replacements instead.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68808 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/combobox.h

@@ -96,6 +96,10 @@ class WXDLLIMPEXP_CORE wxComboBox : public wxChoice,
                 ,const wxString&      rsName = wxComboBoxNameStr
                );
 
+    // See wxComboBoxBase discussion of IsEmpty().
+    bool IsListEmpty() const { return wxItemContainer::IsEmpty(); }
+    bool IsTextEmpty() const { return wxTextEntry::IsEmpty(); }
+
     // resolve ambiguities among virtual functions inherited from both base
     // classes
     virtual void Clear();