Improve m3u-prune — content is not pruned if contains carriage return

[AdamWr]

For example, if m3u8 file contains carriage return (\r), something like:

#EXTM3U\r\n#EXT-X-VERSION:3\r\n#EXT-X-TARGETDURATION:4\r\n#EXT-X-MEDIA-SEQUENCE:0\r\nhttps://advert.com/foo.mp4

Here:

Scriptlets/src/scriptlets/m3u-prune.js

Line 310 in 6c3693f

let lines = text.split(/\n\r|\n|\r/);

when it's "splitted", it adds empty elements to array and it causes that pruning doesn't work.

Example:

'#EXTM3U\r\n#EXT-X-VERSION:3\r\n#EXT-X-TARGETDURATION:4\r\n#EXT-X-MEDIA-SEQUENCE:0\r\nhttps://advert.com/foo.mp4'.split(/\n\r|\n|\r/)

Screenshot

Removing empty elements from array should fixes it.