Only write linkgrp when deprel present

Author: PrinsINT

server/src/main/kotlin/org/ivdnt/galahad/formats/tei/TeiConverter.kt

@@ -64,12 +64,12 @@ class TeiConverter(export: DocumentExport) : LayerConverter(export) {
                     // <linkGrp targFunc="head argument" type="UD-SYN">
                     //     <link target="#d1.p1.s1.w1 #d1.p1.s1.w2" ana="ud-syn:det"/>
                     // </linkGrp>
-                    if (Annotation.DEPREL in export.tagger.annotations) {
+                    if (Annotation.DEPREL in export.tagger.annotations && sentence.terms.any { it.deprel != null }) {
                         writer.writeStartElement("linkGrp")
                         writer.writeAttribute("targFunc", "head argument")
                         writer.writeAttribute("type", "UD-SYN")
                         sentence.terms.forEach { t ->
-                            if (t.deprel?.lowercase() != "root") {
+                            if (t.deprel != null && t.deprel?.lowercase() != "root") {
                                 writer.writeStartElement("link")
                                 writer.writeAttribute("target", "#${sentence.terms[t.head!!.toInt() - 1].id} #${t.id}")
                                 writer.writeAttribute("ana", "ud-syn:${t.deprel}")