fix(utils): check validity of bundledDependencies before iteration

[davidmeirlevy]

check validity of bundledDependencies before iteration

Description

According to NPM, bundledDependencies can also be a Boolean which stands for "all dependencies".

Motivation and Context

When using BundledDependencies according to NPM instructions, lerna fails to bootstrap, showing this error:
TypeError: collection is not iterable

How Has This Been Tested?

I Just added an extra safety test, so before you try to iterate a value, you should first validate that it's actually an array.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[JamesHenry]

Thank you @davidmeirlevy - I did however change it to go with a more robust approach for checking for an array, please take a look at the update I made: 2396bb6