[$20] I can't create New challenge if terms are missing

[ThomasKranitsas]

If terms is missing. The API throws Internal server error. I need to add it as an empty array to get passed this error.

The API should consider the missing property as being empty instead of throwing error.

cc @rootelement

[ThomasKranitsas]

PR: #156

[ThomasKranitsas]

Contest https://www.topcoder.com/challenges/30129016 has been created for this ticket.

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[ThomasKranitsas]

Contest https://www.topcoder.com/challenges/30129016 has been updated - it has been assigned to thomaskranitsas.

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[ThomasKranitsas]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30129016

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