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test/fuzz: prevent abort on specific errors

When running the fuzzer with the `LUA_FUZZER_VERBOSE` environment
variable set, any non-standard error (like `error({})`) may lead to the
crash, since the C++ std::string forbids the use of nullptr for the
construction of a string:
| construction from null is not valid

Hence, this patch checks the error and uses the custom string
specifically for this type of error.

NO_CHANGELOG=fuzzing
NO_DOC=fuzzing

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