Fix exponential search for empty collections (#15362)

Co-authored-by: = <=>

Author: Dhaylight1

searches/exponential_search.py

@@ -85,6 +85,8 @@ def exponential_search(sorted_collection: list[int], item: int) -> int:
     if list(sorted_collection) != sorted(sorted_collection):
         raise ValueError("sorted_collection must be sorted in ascending order")
 
+    if not sorted_collection:
+        return -1
     if sorted_collection[0] == item:
         return 0