Remove old stream instance when reloading the stream
Remove old stream instance when reloading the stream

closes #6472

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