FIX 'NoneType' object has no attribute 'isalpha' (#2440)

passerbya

2025-03-20 5ee2f382b32c5c0beaa1c133b466a100c6fb7ebc

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[submodule "doc"]
    path = doc
    url = https://github.com/gflags/gflags.git
    branch = gh-pages