JSCBC-864: Fixed issue with error handling in LookupIn and MutateIn.
JSCBC-864: Fixed issue with error handling in LookupIn and MutateIn.

Change-Id: I365e758908909fef2cea18b1035bc12c8097f8f6
Reviewed-on: http://review.couchbase.org/c/couchnode/+/152498
Reviewed-by: David Kelly <d83cd2a93a916ce0b0d4c1349b44be044799feca@gmail.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

couchbase/couchnode,couchbase/couchnode,brett19/couchnode,couchbase/couchnode,couchbase/couchnode,brett19/couchnode,brett19/couchnode