Microdvd parsing bug #76
Description
This was discovered in microdvd subtitles, but possibly relates to the other formats as well.
When file ends with whitespaces, i.e. when there are newlines, spaces and so on after the last subtitle (and possibly when there are whitespaces between subtitles), parsing fails. SUbconvert should skip such "empty" lines whenever they are not a part of format (e.g. for SubRip AT LEAST one empty line should be required between subtitles).