Convert options.npmDir only if it's a string.
Convert options.npmDir only if it's a string.

Hansoft/meteor,Hansoft/meteor,mjmasn/meteor,Hansoft/meteor,mjmasn/meteor,mjmasn/meteor,mjmasn/meteor,Hansoft/meteor,chasertech/meteor,Hansoft/meteor,Hansoft/meteor,chasertech/meteor,mjmasn/meteor,chasertech/meteor,chasertech/meteor,chasertech/meteor,chasertech/meteor,Hansoft/meteor,mjmasn/meteor,chasertech/meteor,mjmasn/meteor