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Если значение None работает нормально:

a = np.array(['Cancelled by ', 'Cancelled by Customer',
       'Account not selected', None])

oppty_oppline = pd.DataFrame({'status':a})
print (oppty_oppline)
                  status
0          Cancelled by 
1  Cancelled by Customer
2   Account not selected
3                   None

df = oppty_oppline.dropna(subset = ['status'])
print (df)
                  status
0          Cancelled by 
1  Cancelled by Customer
2   Account not selected

Но если строка None, необходимо удалить строки на boolean indexing :

a = np.array(['Cancelled by ', 'Cancelled by Customer',
       'Account not selected', 'None'])

oppty_oppline = pd.DataFrame({'status':a})
print (oppty_oppline)
                  status
0          Cancelled by 
1  Cancelled by Customer
2   Account not selected
3                   None

#not remove None, because string
df = oppty_oppline.dropna(subset = ['status'])
print (df)
0          Cancelled by 
1  Cancelled by Customer
2   Account not selected
3                   None

df = oppty_oppline[oppty_oppline.status != 'None']
print (df)
0          Cancelled by 
1  Cancelled by Customer
2   Account not selected