#1490
#1490

- Fixes a bug where Batch Export would fail to get timeline focus
- Fixes a bug where Batch Export would fail if you didn’t set a
Destination Preset manually
- Fixes a bug where no error message would appear if Batch Export
failed when triggering `exportDialog:show()`.
- Closes #1490
- Closes #1501

CommandPost/CommandPost,fcpxhacks/fcpxhacks,fcpxhacks/fcpxhacks,CommandPost/CommandPost,CommandPost/CommandPost