[Eporner] Check if video was deleted

[Holek]

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This change gives user a friendly error message, instead of a stacktrace. I couldn't find examples for tests of deleted videos. All of them I found had skip_video flag set, so that's not what I wanted.

If you point me to an example that has this test, I'll gladly add it to the test matrix for this site.

[dirkf]

Partly a matter of taste, but this arrangement could be extended to other error cases by adding to the tuple of error message patterns. It's better then to use the default search for group 1 -- default=None is all that's needed to silence the "not found" case; and the pattern can be relaxed in case the HTML gets split up (I didn't make each space a \s+ which might be logical):

Suggested change

	deleted = self._html_search_regex(r'<strong>Video has been deleted</strong>', webpage, 'deleted', default=False, fatal=False, group=0)
	if deleted:
	raise ExtractorError(
	'Video %s has been deleted' % video_id, expected=True)
	missing = self._html_search_regex((
	r'<strong>\s*(Video has been deleted)\s*</strong>',
	), webpage, 'missing', default=None)
	if missing:
	raise ExtractorError(
	'Video %s is not available: "%s"' % (video_id, missing), expected=True)