Fix api calls with empty person identifier

packages/person-profile/src/person-profile.js

@@ -49,6 +49,7 @@ class PersonProfile extends VPULitElement {
                     }, {}, that.lang);
                     break;
                 case 'value':
+                    if (this.value !== '') {
                         const apiUrl = this.entryPointUrl + '/people/' + this.value;
 
                         // load person
@@ -62,6 +63,7 @@ class PersonProfile extends VPULitElement {
                             .then((person) => {
                                 this.person = person;
                             });
+                    }
                     break;
                 default:
             }