printStatus causes a divide by zero error

[ethankhall]

We're using gh-ost as a library, and testing 8f361f6
I noticed that our test suite fails with

Unhandled error
panic: runtime error: integer divide by zero
Location
github.com/github/gh-ost/go/logic/migrator.go:1019 - (*Migrator).printStatus

It looks like when fbb53f4
was introduced if HooksStatusIntervalSec is set to 0, this panic will happen.

[ninest]

I was getting the same error error trying to run gh-ost as a library: panic: runtime error: integer divide by zero. It is necessary to set the interval

// Cannot be 0
migrationContext.HooksStatusIntervalSec = 1