Update OCR-Models list + small fix for empty list

app/templates/services/spacy_nlp_pipeline.html.j2

@@ -163,3 +163,14 @@
   </div>
 </div>
 {% endblock modals %}
+
+{% block scripts %}
+{{ super() }}
+<script>
+// Disable user model selection if no models are available
+{% if user_spacy_nlp_pipeline_models_count == 0 %}
+optionGroupOptions = document.querySelectorAll(".optgroup-option");
+optionGroupOptions[0].classList.add("disabled");
+{% endif %}
+</script>
+{% endblock scripts %}