Decoding a media playlist which has #EXT-X-KEY without any segments causes panic

[iivarih]

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x0 pc=0x3efcb]

goroutine 1 [running]:
github.com/grafov/m3u8.decodeLineOfMediaPlaylist(0x20821e7e0, 0x20827a000, 0x208256000, 0x0, 0x0, 0x1, 0x0, 0x0)
    /Users/iivari/go/src/github.com/grafov/m3u8/reader.go:478 +0x2b0b

how to reproduce:

main.go:

package main

import (
    "github.com/grafov/m3u8"
    "os"
    "bufio"
)

func main() {
    m3u8.DecodeFrom(bufio.NewReader(os.Stdin), true)
}

test.m3u8:

#EXTM3U
#EXT-X-VERSION:2
#EXT-X-TARGETDURATION:9
#EXT-X-KEY:METHOD=AES-128,URI="http://localhost:20001/key?ecm=AAAAAQAAOpgCAAHFYAaVFH6QrFv2wYU1lEaO2L3fGQB1%2FR3oaD9auWtXNAmcVLxgRTvRlHpqHgXX1YY00%2FpdUiOlgONVbViqou2%2FItyDOWc%3D",IV=0X00000000000000000000000000000000

$cat test.m3u8 | go run main.go

After debbugging this for a while I came up with the following fix:

diff --git a/reader.go b/reader.go
index 770d97f..4b58054 100644
--- a/reader.go
+++ b/reader.go
@@ -163,6 +163,11 @@ func decode(buf *bytes.Buffer, strict bool) (Playlist, ListType, error) {
                        break
                }

+               // possible fix...
+               if len(line) < 1 {
+                       break
+               }
+
                err = decodeLineOfMasterPlaylist(master, state, line, strict)
                if strict && err != nil {
                        return master, state.listType, err

[iivarih]

Blank lines should be ignored so instead of break there should be continue (http://tools.ietf.org/html/draft-pantos-http-live-streaming-12#section-3.1). That would solve this problem and also not decode any blank lines in the buffer.