settingswidget: prevent crash when video device events happen with no account

Change-Id: I657d8b3793399b4a1f1819303c93684577743ada

src/settingswidget.cpp

@@ -1277,7 +1277,8 @@ SettingsWidget::populateVideoSettings()
         }
         ui->deviceBox->setCurrentIndex(deviceIndex);
         setFormatListForDevice(LRCInstance::avModel().getCurrentVideoCaptureDevice());
-
+        try
+        {
             bool isSIP = LRCInstance::getCurrentAccountInfo().profileInfo.type == lrc::api::profile::Type::SIP;
             auto photoBooth = isSIP ? ui->currentSIPAccountAvatar : ui->currentAccountAvatar;
 
@@ -1285,6 +1286,7 @@ SettingsWidget::populateVideoSettings()
                 selectedMenu_ == SettingsMenu::Media) {
                 startPreviewing(false);
             }
+        } catch (...) {}
     }
 
     connect(ui->deviceBox, QOverload<int>::of(&QComboBox::currentIndexChanged),