only show prev/next if there is more than one photo, fixes #813
only show prev/next if there is more than one photo, fixes #813

Muhannes/diaspora,Amadren/diaspora,Muhannes/diaspora,spixi/diaspora,diaspora/diaspora,despora/diaspora,KentShikama/diaspora,spixi/diaspora,spixi/diaspora,despora/diaspora,diaspora/diaspora,despora/diaspora,geraspora/diaspora,Amadren/diaspora,geraspora/diaspora,jhass/diaspora,KentShikama/diaspora,geraspora/diaspora,KentShikama/diaspora,SuperTux88/diaspora,KentShikama/diaspora,jhass/diaspora,SuperTux88/diaspora,Muhannes/diaspora,Flaburgan/diaspora,Amadren/diaspora,Amadren/diaspora,Flaburgan/diaspora,jhass/diaspora,Flaburgan/diaspora,jhass/diaspora,despora/diaspora,diaspora/diaspora,Flaburgan/diaspora,geraspora/diaspora,Muhannes/diaspora,spixi/diaspora,diaspora/diaspora,SuperTux88/diaspora,SuperTux88/diaspora