Merge pull request #258 from billd100/master

Unavailable videos throw VideoUnavailable exception.

pytube/__main__.py

@@ -21,6 +21,7 @@ from pytube import Stream
 from pytube import StreamQuery
 from pytube.compat import install_proxy
 from pytube.compat import parse_qsl
+from pytube.exceptions import VideoUnavailable
 from pytube.helpers import apply_mixin
 
 logger = logging.getLogger(__name__)
@@ -156,6 +157,8 @@ class YouTube(object):
 
         """
         self.watch_html = request.get(url=self.watch_url)
+        if '<img class="icon meh" src="/yts/img' not in self.watch_html:
+            raise VideoUnavailable('This video is unavailable.')
         self.embed_html = request.get(url=self.embed_url)
         self.age_restricted = extract.is_age_restricted(self.watch_html)
         self.vid_info_url = extract.video_info_url(

pytube/exceptions.py

@@ -34,3 +34,7 @@ class ExtractError(PytubeError):
 
 class RegexMatchError(ExtractError):
     """Regex pattern did not return any matches."""
+
+
+class VideoUnavailable(PytubeError):
+    """Video is unavailable."""