[IB-468] Fixed app crash when removing first tab
[IB-468] Fixed app crash when removing first tab

cliqz-oss/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios