PadMessageHandler: reversed condition to make core logic evident. No behavioural changes.

This one replaces a big "if (message)" negating its truthy condition.

Being lame, I erred on the safe side and wrote a super ugly statement that is
guaranteed to respect the original logic.

In the hope that eventual logic errors become more evident now.

See: https://stackoverflow.com/questions/36661748/what-is-the-exact-negation-of-ifvariable-in-javascript#36661843

src/node/handler/PadMessageHandler.js

@@ -244,7 +244,19 @@ exports.handleMessage = function(client, message)
     }
   };
 
-  if (message) {
+  /*
+   * In a previous version of this code, an "if (message)" wrapped the
+   * following async.series().
+   * This ugly "!Boolean(message)" is a lame way to exactly negate the truthy
+   * condition and replace it with an early return, while being sure to leave
+   * the original behaviour unchanged.
+   *
+   * A shallower code could maybe make more evident latent logic errors.
+   */
+  if (!Boolean(message)) {
+    return;
+  }
+
   async.series([
     handleMessageHook,
     //check permissions
@@ -297,7 +309,6 @@ exports.handleMessage = function(client, message)
     },
     finalHandler
   ]);
-  }
 }