[Bug 764870] qtdemux: Fix parsing segment duration of empty edit list box

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764870

--- Comment #2 from Seungha Yang <sh.yang at lge.com> ---
This is a patch for regression of bug #760781
Please refer to 
https://bugzilla.gnome.org/show_bug.cgi?id=760781#c9

bug #760781 did not consider empty edit when checking "zero segment duration"
edit

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