fix: handle empty input in jump_search (#14807)

Co-authored-by: Lucas Ma <7184042+pony-maggie@users.noreply.github.com>

Author: pony-maggie

searches/jump_search.py

@@ -33,8 +33,11 @@ def jump_search[T: Comparable](arr: Sequence[T], item: T) -> int:
     10
     >>> jump_search(["aa", "bb", "cc", "dd", "ee", "ff"], "ee")
     4
+    >>> jump_search([], 1)
+    -1
     """
-
+    if not arr:
+        return -1
     arr_size = len(arr)
     block_size = int(math.sqrt(arr_size))