Fixed team schedules before 2010

[WakeUpWaffles]

Originally was looking into #68, but seems to all ready be handled after creating tests. It is handled by this code:

kenpompy/kenpompy/team.py

Lines 74 to 77 in a30590b

	if team==None or team not in get_valid_teams(browser, season):
	raise ValueError(
	'the team does not exist in kenpom in the given year. Check that the spelling matches (https://kenpom.com) exactly.')

However, I found an issue with team's schedules not having a rank column 2010 and earlier. Added logic to handle the missing column.

test_team.py test coverage now includes:

• Teams with no data for a given year
• Incorrect team names
• Team's schedule 2010 and before

[j-andrews7]

Yeah, seems like a good idea. I will try to roll all the PRs in by the end of the week to get a release out to fix most of the outstanding issues.