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Merge pull request #51 from RexSkz/rex/prevent-panic-caused-by-null-value

If the request body is a JSON like `{"test":null}`, govalidator will panic when executing `traverseMap`.

```go
var m = make(map[string]interface{})
json.Unmarshal([]byte(`{"test":null}`), &m)
```

Since `m["test"]` is `nil`, `reflect.TypeOf(v)` will panic. This PR fixes the bug by dropping null values in json.

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