Fix #6398: honor null recovery for array-shaped builders - #6406

if (!_useVanillaProcessing(ctxt)) {
    return finishBuild(ctxt, _deserializeNonVanilla(p, ctxt));
}

@JsonDeserialize(builder = Value.Builder.class)
@JsonFormat(shape = JsonFormat.Shape.ARRAY)
public static class Value {
    public int x;

    @JsonPropertyOrder({ "x" })
    @JsonFormat(shape = JsonFormat.Shape.ARRAY)
    public static class Builder {
        int x;

        public Builder(int a, int b) { } // no default, delegating or properties-based Creator
        public Builder withX(int v) { x = v; return this; }
        public Value build() {
            Value r = new Value();
            r.x = x;
            return r;
        }
    }
}

ObjectMapper mapper = JsonMapper.builder()
        .addHandler(new DeserializationProblemHandler() {
            @Override
            public Object handleMissingInstantiator(DeserializationContext ctxt, Class<?> instClass,
                    ValueInstantiator valueInsta, JsonParser p, String msg) {
                p.skipChildren();
                return null;
            }
        })
        .build();

mapper.readValue("[1,2]", Value.class);

protected final Object finishBuild(DeserializationContext ctxt, Object builder)
    throws JacksonException
{
    if (builder == null) {
        return null;
    }
    try {
        return _buildMethod.getMember().invoke(builder, (Object[]) null);
    } catch (Exception e) {
        return wrapInstantiationProblem(ctxt, e);
    }
}