remove last file from list if broken.

Nasty code, regarding side effect of function, but does the trick for now.

processing/tools.py

@@ -43,6 +43,7 @@ def get_start_end(files: List[Path]):
             last = open_nc(files[-2])
             end = last.time[-1]
             date_end = fix_abs_datetime(end)
+            del files[-1]
         except IndexError:
             raise BadDataset(f"Can't deduce times from {files}") from None