Deploy strategies use three different exception types for empty-array fault #4732

What happened?

Calling next() on a deploy strategy whose available array is empty produces a different exception per strategy:

• OneOnEach: IndexOutOfBoundsException
• RoundRobinDeployment: ArithmeticException (divide-by-zero on index = (index + 1) % length)
• RandomDeployment: IllegalArgumentException (Random.nextInt(0) rejects bound 0)

The shared DeployStrategy trait gives no contract for the empty-array case, but a unified failure mode would make callers easier to write.

How to reproduce?

For each strategy, init with Array.empty[Address] and call next():

OneOnEach().tap(_.initialize(Array.empty)).next()           // IndexOutOfBoundsException
RoundRobinDeployment().tap(_.initialize(Array.empty)).next() // ArithmeticException
RandomDeployment().tap(_.initialize(Array.empty)).next()    // IllegalArgumentException

Version

1.1.0-incubating (Pre-release/Master)