[BUG]Accessing video length runs into error

[krisyang1125]

Version: 15.0.0

Bug Description When accessing length attribute of Youtube object, runs into error below that indicates lack of None handling: File "/.venv/lib/python3.11/site-packages/pytube/__main__.py", line 383, in length return int(self.vid_info.get('videoDetails', {}).get('lengthSeconds')) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: int() argument must be a string, a bytes-like object or a real number, not 'NoneType'

To Reproduce Create a Youtube object with provided URL, and access video length. This will run into error above. pytube.Youtube(video_url).length

Expected behavior A number in seconds indicating video length is returned, if not available returns None

Output File "/.venv/lib/python3.11/site-packages/pytube/__main__.py", line 383, in length return int(self.vid_info.get('videoDetails', {}).get('lengthSeconds')) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: int() argument must be a string, a bytes-like object or a real number, not 'NoneType'

System information Please provide the following information:

• Python version: Python 3.9.19 (This works on Python 3.9.6)
• Pytube version: 15.0.0
• Command used to install pytube: pip install pytube

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[cluster-coder]

This bug hit pretty hard one of my scripts, oh god how sudden ;-;