Fix bugs

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/src/main/java/com/nextcloud/talk/adapters/items/AdvancedUserItem.java

@@ -114,7 +114,7 @@ public class AdvancedUserItem extends AbstractFlexibleItem<AdvancedUserItem.User
 
         holder.serverUrl.setText(userEntity.getBaseUrl());
 
-        if (userEntity != null && userEntity.getBaseUrl().startsWith("http://") || userEntity.getBaseUrl().startsWith("https://")) {
+        if (userEntity != null && userEntity.getBaseUrl() != null && userEntity.getBaseUrl().startsWith("http://") || userEntity.getBaseUrl().startsWith("https://")) {
             holder.avatarImageView.setVisibility(View.VISIBLE);
             GlideUrl glideUrl = new GlideUrl(ApiUtils.getUrlForAvatarWithName(userEntity.getBaseUrl(),
                     participant.getUserId(), R.dimen.avatar_size), new LazyHeaders.Builder()

app/src/main/java/com/nextcloud/talk/controllers/bottomsheet/OperationsMenuController.java

@@ -185,7 +185,7 @@ public class OperationsMenuController extends BaseController {
 
             switch (operationCode) {
                 case 1:
-                    ncApi.leaveRoom(credentials, ApiUtils.getUrlForSettingMyselfAsActiveParticipant(currentUser.getBaseUrl(), conversation.getToken()))
+                    ncApi.removeSelfFromRoom(credentials, ApiUtils.getUrlForRemoveSelfFromRoom(currentUser.getBaseUrl(), conversation.getToken()))
                             .subscribeOn(Schedulers.newThread())
                             .observeOn(AndroidSchedulers.mainThread())
                             .retry(1)

app/src/main/java/com/nextcloud/talk/jobs/LeaveConversationWorker.java

@@ -82,7 +82,7 @@ public class LeaveConversationWorker extends Worker {
             EventStatus eventStatus = new EventStatus(operationUser.getId(),
                     EventStatus.EventType.CONVERSATION_UPDATE, true);
 
-            ncApi.leaveRoom(credentials, ApiUtils.getUrlForSettingMyselfAsActiveParticipant(operationUser.getBaseUrl(), conversationToken))
+            ncApi.removeSelfFromRoom(credentials, ApiUtils.getUrlForRemoveSelfFromRoom(operationUser.getBaseUrl(), conversationToken))
                     .subscribeOn(Schedulers.newThread())
                     .blockingSubscribe(new Observer<GenericOverall>() {
                         Disposable disposable;