get_values eagerly loads sections before return

Author: kfreezen

Diff for: git/config.py

@@ -796,6 +796,7 @@ def get_values(
         :raise TypeError: in case the value could not be understood
             Otherwise the exceptions known to the ConfigParser will be raised."""
         try:
+            self.sections()
             lst = self._sections[section].getall(option)
         except Exception:
             if default is not None: