Compiles but several y2r compile errors

Error:
* ```y2r/lib/y2r/parser.rb:72:in `element_to_node': undefined method `name' for nil:NilClass (NoMethodError)```

Affected include and clients files, like:
* ```yast/work/printer/src/include/printer/dialogs.ycp```
* ```yast/work/printer/src/clients/printer.ycp```