removed not necessary if condition

removed a not necssary if condition which checked weather the stream
array contains "" or null but there can't be an stream like this because
of the isOnline function
head fix

fixed a ofset-bug
added a tooltip
changed the img alternative
added missing px attribute
removed debug code
stream height number 10000..

because of the calc( ) bug with % and vh the content height is now 90vh
updated changelog

changelog