Bootstrap command fails when package -> bundledDependencies is a Boolean

[davidmeirlevy]

when a package has a "bundledDependencies": true (valid value by the NPM documentation) the command lerna bootstrap fails.

Expected Behavior

running lerna bootstrap should work as expected and install packages.

Current Behavior

exit 1 with console error: TypeError: collection is not iterable

Possible Solution

check if the value is an array before trying to iterate it:
#2960

Steps to Reproduce (for bugs)

1. create a monorepo project
2. run lerna bootstrap - will work as expected.
3. add "bundledDependencies": true to one of the packages in the monorepo.
4. run again lerna bootstrap.
5. error will be shown.

Context

by the NPM documentation, "bundledDependencies" can be either an array or a boolean.
the code at lerna took for granted that if this value exists - it's an array. that is a wrong assumption.