After upgrade to 5.0.1 site web.magentatv.de does not work anymore

mistergefahrensucher wrote:

I use my existing WebGrab++.config.xml from a workin 3.0.3
Here the error:
update requested for - 10 - out of - 10 - channels for 8 day(s)
( 1/10 ) WEB.MAGENTATV.DE -- chan. (xmltv_id=Das Erste) -- mode Incremental
p
error downloading page: The format of value '' is invalid.
i
error downloading page: The format of value '' is invalid.
no shows in indexpage!
Summary for update of Das Erste
no changes, no update necessary !
unchanged shows inspected 0
Windows or Linux are the same issue.
Another WebGrab++.config.xml with m.tvtoday.de is working. But i need web.magentatv.de.
So at the moment i have to rollback to 3.0.3.

Looks like i found the reason.
In 5.0.1 it is mandantory to enter a useragent. If you leave it empty like me

web.magentatv.de don't like webgrab.
now i use for example
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0
i got data
strange