fixed regex error on certain bugs, view counts, and rating

pytube/__main__.py

@@ -269,7 +269,12 @@ class YouTube(object):
         :rtype: str
 
         """
-        return self.player_config_args['player_response']['videoDetails']['averageRating']
+        return (
+            self.player_config_args
+            .get('player_response', {})
+            .get('videoDetails', {})
+            .get('averageRating')
+        )
 
     @property
     def length(self):
@@ -287,7 +292,12 @@ class YouTube(object):
         :rtype: str
 
         """
-        return self.player_config_args['player_response']['videoDetails']['viewCount']
+        return (
+            self.player_config_args
+            .get('player_response', {})
+            .get('videoDetails', {})
+            .get('viewCount')
+        )
 
     def register_on_progress_callback(self, func):
         """Register a download progress callback function post initialization.

setup.cfg

@@ -3,7 +3,7 @@ commit = True
 tag = True
 current_version = 9.4.0
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\-(?P<release>[a-z]+))?
-serialize = 
+serialize =
 	{major}.{minor}.{patch}
 
 [metadata]
@@ -15,9 +15,8 @@ description-file = README.md
 
 [coverage:run]
 source = pytube
-omit = 
+omit =
 	pytube/compat.py
 
 [flake8]
 ignore = W605
-