preetapan 77c972f594 Fixes agent error handling when check definition is invalid. Distingu… (#3560)
* Fixes agent error handling when check definition is invalid. Distinguishes between empty checks vs invalid checks

* Made CheckTypes return Checks from service definition struct rather than a new copy, and other changes from code review. This also errors when json payload contains empty structs

* Simplify and improve validate method, and make sure that CheckTypes always returns a new copy of validated check definitions

* Tweaks some small style things and error messages.

* Updates the change log.
2017-10-10 16:54:06 -07:00
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