Normalize block_actions from home and modal surfaces

Author: ryansydnor

lib/SlackBot.js

@@ -565,7 +565,13 @@ function Slackbot(configuration) {
 
             // normalize fields to match the rtm message format
             message.user = message.user.id;
-            message.channel = message.channel.id;
+            
+            // home and modal surfaces don't have channel IDs
+            if ((message.view && (message.view.type === 'home' || message.view.type === 'modal'))) {
+                message.channel = {};    
+            } else {
+                message.channel = message.channel.id;
+            }
 
             // move the first action's value into text field
             // this allows conversations to "hear" the action value