Fix issue where insert size metrics failed on a sample without adapters

src/sequali/report_modules.py

@@ -1828,7 +1828,7 @@ def select_relevant_adapters(adapter_list: Sequence[Tuple[str, int]]):
         """
         # Sort list on count
         sorted_list = sorted(adapter_list, reverse=True, key=lambda x: (x[1]))
-        new_list = []
+        new_list = [("", 0) for _ in range(INSERT_SIZE_MAX_ADAPTER_STORE_SIZE)]
         lengths_to_get = set(range(1, INSERT_SIZE_MAX_ADAPTER_STORE_SIZE + 1))
         for adapter, count in sorted_list:
             if len(adapter) in lengths_to_get: