fix: prevent undefined in people-picker option labels for line two (#2211)

Author: gavinbarron

packages/mgt-components/src/components/mgt-people-picker/mgt-people-picker.ts

@@ -950,7 +950,7 @@ export class MgtPeoplePicker extends MgtTemplatedComponent {
            person => person.id,
            person => {
              const lineTwo = person.jobTitle || (person as User).mail;
-             const ariaLabel = `${this.strings.suggestedContact} ${person.displayName} ${lineTwo}`;
+             const ariaLabel = `${this.strings.suggestedContact} ${person.displayName} ${lineTwo ?? ''}`;
              return html`
                <li
                 id="${person.id}"