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	Add clarification that MQTT Out requires payload to send msg
Fixes #2370
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		| @@ -36,7 +36,7 @@ | ||||
|     <h3>Inputs</h3> | ||||
|     <dl class="message-properties"> | ||||
|        <dt>payload <span class="property-type">string | buffer</span></dt> | ||||
|        <dd> most users prefer simple text payloads, but binary buffers can also be published.</dd> | ||||
|        <dd> the payload to publish. If this property is not set, no message will be sent. To send a blank message, set this property to an empty String.</dd> | ||||
|  | ||||
|        <dt class="optional">topic <span class="property-type">string</span></dt> | ||||
|        <dd> the MQTT topic to publish to.</dd> | ||||
|   | ||||
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