fix: guard bottom-nav against NPE when no account is set - #5012

fix: guard bottom-nav against NPE when no account is set#5012

jesmrec merged 4 commits into

owncloud:masterowncloud/android:masterfrom

ibrahim-iqbal:fix/4998-nullable-storage-manager-npeibrahim-iqbal/owncloud-android-fork:fix/4998-nullable-storage-manager-npeCopy head branch name to clipboard