Test fix + empty relation

cypress/platform/xss7.html

@@ -54,11 +54,7 @@
         // themeCSS: '.edgePath .path {stroke: red;} .arrowheadPath {fill: red;}',
         logLevel: 0,
         state: {
-<<<<<<< HEAD
           defaultRenderer: 'dagre-d3',
-=======
-          defaultRenderer: 'dagre-wrapper',
->>>>>>> master
         },
         flowchart: {
           // defaultRenderer: 'dagre-wrapper',

src/diagrams/common/common.js

@@ -65,6 +65,7 @@ const sanitizeMore = (text, config) => {
 };
 
 export const sanitizeText = (text, config) => {
+  if(!text) return text;
   const txt = DOMPurify.sanitize(sanitizeMore(text, config));
   return txt;
 };