change meta desc truncate method

src/app/editorialisation/services/seo.service.ts

@@ -31,6 +31,16 @@ export class SeoSErvice {
     const imageUrl = (post.content.og_image != null) ?
         post.content.og_image : post.content.featureImage;
 
+    var description: string = '';
+    if (post.content.meta_description) {
+      description = post.content.meta_description;
+    }
+    else {
+      description = post.content.excerpt;
+      if (description.length > 140 ) {
+        description = `${description.substr(0,description.substr(0,136).lastIndexOf(' '))}...`;
+      }
+    }
     var description: string = post.content.meta_description ?
         post.content.meta_description : `${post.content.excerpt.slice(0,136)}...`;