As of https://github.com/influxdata/platform/pull/2192 a panic was
introduced in the startup of platform. It is the result of
`Error{Code,Op,Message}` being passed a `(*platform.Error)(nil)`
instead of an `(error)(nil)`.
Specifically
```
if err == nil {
return ""
} else if e, ok := err.(*Error); ok && e.Code != "" {
return e.Code
}
```
will panic when err is `(*platform.Error)(nil)` as the `err == nil`
check will fail and the `e, ok := err.(*Error); ok && e.Code != ""` will
succeed and panic on `e.Code`, as `e` is nil.
This panic could have been avoided if all methods returned `error`
instead of `*platform.Error`.
Michael Desa
zhulongcheng
Kelvin Wang
Chris Goller