In the Flutter engine we saw an NPE in the analyzer package when running Dartdoc on the FFI native function bindings
(example: https://ci.chromium.org/ui/p/flutter/builders/try/Linux%20docs_test/10279/overview)

This happens when the analyzer checks an FfiNative annotation applied to a getter.

FfiVerifier._checkFfiNative assumes that every MethodDeclaration has parameters and needs a special case for methods with the isGetter flag.

@cskau-g