Fix the default navigation theme selection on invalid id
Fix the default navigation theme selection on invalid id

iiet/iiet-git,jirutka/gitlabhq,iiet/iiet-git,iiet/iiet-git,axilleas/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,dreampet/gitlab,dreampet/gitlab,dreampet/gitlab,mmkassem/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,jirutka/gitlabhq,stoplightio/gitlabhq