add 'obs-id' as mandatory filter field

ldvspec/lofardata/templates/lofardata/workspecification/create_update.html

@@ -204,7 +204,11 @@
                             The input is invalid:
                             {% for field, errors in form.errors.items %}
                                 {% for error in errors %}
-                                    <li class="text text--red text--faded">{{ field }}: {{ error }}</li>
+                                    {% if field == '__all__' %}
+                                        <li class="text text--red text--faded">{{ error }}</li>
+                                    {% else %}
+                                        <li class="text text--red text--faded">{{ field }}: {{ error }}</li>
+                                    {% endif %}
                                 {% endfor %}
                             {% endfor %}
                         </div>

[Fanna Lautenbach]

Beetje smerig dus als je wat beters weet, lmk!

[Robbie Luijben]

The check on 'all' indicates a non-field error right? So maybe using this is more clear: https://docs.djangoproject.com/en/4.1/ref/forms/api/#django.forms.Form.non_field_errors (see also https://stackoverflow.com/a/2525921)

[Fanna Lautenbach]

'form.error.items' are combined (so including the non-field errors). So if you do that you have to filter them out of all the items