b10872

jinja: treat a null left operand of in as a plain lookup (#28620)

Templates that default an optional variable to none and then test its
membership in a map hit an error, while the same expression is a normal
lookup returning false in Jinja. The undefined counterpart of this case
was already handled just above.

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/46177710

macOS/iOS:

• macOS Apple Silicon (arm64)
• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
• macOS Intel (x64)
• iOS XCFramework

Linux:

• Ubuntu x64 (CPU)
• Ubuntu arm64 (CPU)
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• Ubuntu x64 (ROCm 10.0)
• Ubuntu x64 (OpenVINO)
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Android:

• Android arm64 (CPU)

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• Windows x64 (Vulkan)
• Windows x64 (OpenVINO)
• Windows x64 (SYCL)
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openEuler:

• DISABLED
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• UI