Update chaining.py

Author: ivanmmarkovic

hash-table/chaining.py

@@ -90,8 +90,12 @@ def delete(self, key: int) -> None:
                     found = True
                 else:
                     i += 1
-            if found:
-                items.pop(i)
+            if not found:
+                return None
+            
+            items.pop(i)
+            if len(items) == 0:
+                self.table[index] = None
             return None