EDL cmx_3600 adapter does not support unnamed markers.

[elabrosseRodeofx]

This is the content of an cmx_3600 EDL exported from Avid media composer:

TITLE:   Untitled Sequence.01 
FCM: NON-DROP FRAME
001  103043_0 V     C        01:00:00:00 01:00:08:10 01:00:00:00 01:00:08:10 
* FROM CLIP NAME:  MYMEDIA.MOV 
* LOC: 01:00:02:01 RED

As you can see the marker does not have a name

Current behavior:

>>> timeline = otio.adapters.read_from_file('markers.edl')
>>> list(timeline.each_clip())[0].markers
[]

Expected behavior:

>>> timeline = otio.adapters.read_from_file('markers.edl')
>>> list(timeline.each_clip())[0].markers
[
otio.schema.Marker(name='', marked_range=otio.opentime.TimeRange(start_time=otio.opentime.RationalTime(value=86449, rate=24), duration=otio.opentime.RationalTime(value=0, rate=1)), metadata={'cmx_3600': {'color': u'RED'}})
]

From what I saw this is due to the regular expression that matches locator comments in cmx_3600.py line 457. Should OpenTimelineIO support unnamed markers ? I feel like it should since some editing systems are able to export unnamed markers. Let me know what you think !

My corporation is waiting for confirmation that our CLA was received. We will submit a PR as soon as possible.

[elabrosseRodeofx]

Made a PR:

https://github.com/PixarAnimationStudios/OpenTimelineIO/pull/598

[jminor]

Fixed by #598