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Summary: opt-stats.py and opt-viewer.py's argument parsers both take a positional argument 'yaml_files'. Positional arguments in Python's argparse module are required by default, so the subsequent checks for `len(args.yaml_files) == 0` are unnecessary -- if the length was zero, then the call to `parser.parse_args()` would have thrown an error already. Because there is no way for `len(args.yaml_files)` to be zero at these points, removing the code is NFC. Reviewers: anemet, davidxl Reviewed By: anemet Subscribers: llvm-commits, fhahn Differential Revision: https://reviews.llvm.org/D34567 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306147 91177308-0d34-0410-b5e6-96231b3b80d8