document that GetAttribute's argument must not be NULL
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48930 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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@ -207,7 +207,8 @@ Returns a pointer to the parent of this node or \NULL if this node has no parent
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\constfunc{bool}{GetAttribute}{\param{const wxString\& }{attrName}, \param{wxString* }{value}}
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Returns \true if a attribute named {\it attrName} could be found.
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If the {\it value} pointer is not \NULL, the value of that attribute is saved there.
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The value of that attribute is saved in \arg{value} (which
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must not be \NULL).
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\constfunc{wxString}{GetAttribute}{\param{const wxString\& }{attrName}, \param{const wxString\& }{defaultVal}}
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