Fix issue pulling football league positions

Occasionally, a team's league position will not be posted on their team
page, throwing an error while attempting to parse that information.
Defaulting the value to None in this scenario will skip the error while
allowing expected functionality to continue.

Signed-Off-By: Robert Clark <robdclark@outlook.com>

sportsreference/fb/team.py

@@ -165,12 +165,15 @@ def _records(self, record_line):
         records = record_line.lower().replace('record: ', '')
         records_split = records.split(',')
         if len(records_split) != 3:
-            return None, None, None
+            return None, None, None, None
         record, points, position = records_split
         points = re.sub(' point.*', '', points).strip()
         position = re.sub(r'\(.*\)', '', position).strip()
         league = re.sub('.* in ', '', position).title()
-        position = re.findall(r'\d+', position)[0]
+        try:
+            position = re.findall(r'\d+', position)[0]
+        except IndexError:
+            position = None
         return record, points, position, league
 
     def _goals(self, goals_line):

tests/unit/test_fb_team.py

@@ -52,7 +52,14 @@ def test_records_missing_result(self):
 
         output = self.team._records(html)
 
-        assert output == (None, None, None)
+        assert output == (None, None, None, None)
+
+    def test_records_missing_position(self):
+        html = 'Record: 5-0-0, 15 points (3.0 per game),  Premier League'
+
+        output = self.team._records(html)
+
+        assert output == ('5-0-0', '15', None, 'Premier League')
 
     def test_goals_missing(self):
         html = 'Goals: 20 (2.5 per game), Goals Against: 11 (1.38 per game)'