Added decorator to test availability of datasets

Used decorator tool to validate dataset exists on views

ref-test/app/editor/views.py

@@ -1,6 +1,7 @@
 from ..forms.admin import EditDataset
 from ..models import Dataset, User
 from ..tools.forms import get_dataset_choices, send_errors_to_client
+from ..tools.data import check_dataset_exists
 
 from flask import Blueprint, flash, jsonify, redirect, render_template, request
 from flask.helpers import url_for
@@ -27,6 +28,7 @@ def _editor():
     return render_template('/editor/index.html', form=form)
 
 @editor.route('/<string:id>/')
+@check_dataset_exists
 @login_required
 def _editor_console(id:str=None):
     dataset = Dataset.query.filter_by(id=id).first()