fix clang-analyzer-core.NullDereference ... #1388
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which was due clang making false assumptions. But I think the modified code is easier for both humans and clang to understand.
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which was due clang making false assumptions.
However, the existing code did dereference the cend() iterator but didn't use the dereferenced value.
In any event the modified code is easier for both humans and clang to understand and doesn't dereference cend().