Fix latest linting error in sorteddict.py

Author: althonos

sortedcontainers/sorteddict.py

@@ -429,8 +429,7 @@ def pop(self, key, default=__not_given):
         else:
             if default is self.__not_given:
                 raise KeyError(key)
-            else:
-                return default
+            return default
 
 
     def popitem(self, index=-1):

sortedcontainers/sortedlist.py

@@ -1653,8 +1653,8 @@ def _check(self):
                         child_sum = self._index[child] + self._index[child + 1]
                         assert child_sum == self._index[pos]
         except:
-            import sys
-            import traceback
+            import sys # pylint: disable=import-outside-toplevel
+            import traceback # pylint: disable=import-outside-toplevel
             traceback.print_exc(file=sys.stdout)
             print('len', self._len)
             print('load', self._load)
@@ -2607,8 +2607,8 @@ def _check(self):
                         child_sum = self._index[child] + self._index[child + 1]
                         assert child_sum == self._index[pos]
         except:
-            import sys
-            import traceback
+            import sys # pylint: disable=import-outside-toplevel
+            import traceback # pylint: disable=import-outside-toplevel
             traceback.print_exc(file=sys.stdout)
             print('len', self._len)
             print('load', self._load)