[Bug 797035] New: subparse: Remove checking text buffer length

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797035

            Bug ID: 797035
           Summary: subparse: Remove checking text buffer length
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hosang10.lee at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 373471
  --> https://bugzilla.gnome.org/attachment.cgi?id=373471&action=edit
subparse: Remove checking text buffer length

It is possible for subtitle files to have a string length less than 30.
WebVTT for example may contain only the 'WEBVTT' string in the file.
As an example in hls streams, since WEBVTT files can be segemented
like video/audio, some subtitle segements may only contain just the
header string.
Returning null here results to the pads not being exposed properly.

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