Game (goals_against) data returning "None"

[david-hosk]

Describe the bug
When I try to retrieve goals_against, I receive "None" as a response.

To Reproduce
from sportsipy.nhl.teams import Team

nashville = Team('NSH')

print(nashville.goals_for)
print(nashville.goals_against)

Expected behavior
I expect to receive,

30
37

30 for goals_for, and 37 for goals_against.

I receive, however,

30
None

Screenshots

Desktop (please complete the following information):

• OS: [e.g. Ubuntu 18.04]
• Sportsipy Version: [e.g. 0.6.0 or commit hash if using code]

Additional context
Along with missing goals_against, I am also missing pdo_at_even_strength and total_goals_per_game.