We currently do not support clearing teams from an escalation policy.

This commit fixes that by sending an empty list instead of ignoring
the field if it's not set.

escalation_policy.go

@@ -25,7 +25,7 @@ type EscalationPolicy struct {
 	EscalationRules []EscalationRule `json:"escalation_rules,omitempty"`
 	Services        []APIObject      `json:"services,omitempty"`
 	NumLoops        uint             `json:"num_loops,omitempty"`
-	Teams           []APIReference   `json:"teams,omitempty"`
+	Teams           []APIReference   `json:"teams"`
 	Description     string           `json:"description,omitempty"`
 	RepeatEnabled   bool             `json:"repeat_enabled,omitempty"`
 }