OO-291: fix NPE in import wizard of member in a group/course

src/main/java/org/olat/course/member/EditMembershipController.java

@@ -121,7 +121,7 @@ public class EditMembershipController extends FormBasicController {
 		super(ureq, wControl, "edit_member");
 		
 		this.member = null;
-		this.members = new ArrayList<Identity>(members);
+		this.members = (members == null ? null : new ArrayList<Identity>(members));
 		this.repoEntry = repoEntry;
 		this.withButtons = true;
 		repositoryManager = CoreSpringFactory.getImpl(RepositoryManager.class);
@@ -138,7 +138,7 @@ public class EditMembershipController extends FormBasicController {
 		super(ureq, wControl, LAYOUT_CUSTOM, "edit_member", rootForm);
 		
 		this.member = null;
-		this.members = new ArrayList<Identity>(members);
+		this.members = (members == null ? null : new ArrayList<Identity>(members));
 		this.repoEntry = repoEntry;
 		this.withButtons = false;
 		repositoryManager = CoreSpringFactory.getImpl(RepositoryManager.class);

src/main/java/org/olat/course/member/wizard/_i18n/LocalStrings_de.properties

@@ -3,5 +3,5 @@ import.import.title=Benutzernamen angeben
 import.confirm.title=berprfen
 import.permission.title=Berechtigungen
 import.mail.title=E-Mail-Benachrichtigung
-form.names.example=aoi,kanu,
+form.names.example=test01<br/>author02<br/>
 form.addusers=Benutzername
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