Lifetime Model: Ignore empty lines rucio#7444

The `dids` variable is only iterated over, so there is no need to
convert it from a set into a list.

Also ensure the file ends with a newline.

lib/rucio/client/commands/bin_legacy/rucio.py

@@ -1987,7 +1987,8 @@ def add_lifetime_exception(args, client, logger, console, spinner):
         logger.error('inputfile is mandatory')
         return FAILURE
     with open(args.inputfile) as infile:
-        dids = list(set(line.strip() for line in infile))
+        # Deduplicate the content of the input file and ignore empty lines.
+        dids = set(did for line in infile if (did := line.strip()))
 
     dids_list = []
     containers = []
@@ -2821,3 +2822,4 @@ def main():
 
 if __name__ == '__main__':
     main()
+