m3u import is aborted if there is a blank line

[mixxxbot]

Reported by: daschuer
Date: 2018-12-02T19:32:59Z
Status: Fix Released
Importance: Medium
Launchpad Issue: lp1806271

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This was reported here:
https://www.mixxx.org/forums/viewtopic.php?f=3&t=12328&p=40486#p40486

[mixxxbot]

Commented by: daschuer
Date: 2018-12-02T19:43:25Z

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#1927

[mixxxbot]

Issue closed with status Fix Released.