Check known m_Desc field before m_Fields.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/16971

common/lib_tree_model_adapter.cpp

@@ -674,10 +674,10 @@ void LIB_TREE_MODEL_ADAPTER::GetValue( wxVariant&              aVariant,
         {
             const wxString& key = m_colIdxMap.at( aCol );
 
-            if( node->m_Fields.count( key ) )
-                valueStr = UnescapeString( node->m_Fields.at( key ) );
-            else if( key == wxT( "Description" ) )
+            if( key == wxT( "Description" ) )
                 valueStr = UnescapeString( node->m_Desc );
+            else if( node->m_Fields.count( key ) )
+                valueStr = UnescapeString( node->m_Fields.at( key ) );
             else
                 valueStr = wxEmptyString;
         }

eeschema/symbol_tree_synchronizing_adapter.cpp

@@ -282,10 +282,10 @@ void SYMBOL_TREE_SYNCHRONIZING_ADAPTER::GetValue( wxVariant& aVariant, wxDataVie
 
             wxString valueStr;
 
-            if( node->m_Fields.count( key ) )
-                valueStr = node->m_Fields.at( key );
-            else if( key == wxT( "Description" ) )
+            if( key == wxT( "Description" ) )
                 valueStr = node->m_Desc;
+            else if( node->m_Fields.count( key ) )
+                valueStr = node->m_Fields.at( key );
             else
                 valueStr = wxEmptyString;