Guard agains null array member input causing panic

[aaronkavlie-wf]

Problem

If you have nested rules that expect an array of objects, like so:

"stuff": [
    {"foo": "bar1"},
    {"foo": "bar2"}
]

a null array member will cause a panic:

"stuff": [null]

Solution

Check for nil values and throw an error.

Code Review

@alexandercampbell-wf @tylertreat-wf

[tylertreat-wf]

This can just be errors.New("nested value is nil") instead of using fmt.Errorf since you're not formatting anything.

[aaronkavlie-wf]

oh yeah, had it that way at first, forgot to change back :-)

[tylertreat-wf]

lgtm

[tylertreat-wf]

+1

[tannermiller-wf]

+1