log an error in applyPreset if room in list cannot be found with tests

lib/prototypes/SonosSystem/applyPreset.js

@@ -89,7 +89,15 @@ function applyPreset(preset) {
   let coordinator;
 
   promise = promise.then(() => {
-    players = preset.players.map(playerInfo => this.getPlayer(playerInfo.roomName));
+    players = preset.players.map(playerInfo => {
+        const result = this.getPlayer(playerInfo.roomName);
+        if (!result) {
+          logger.error(`preset ${preset.favorite}: bad room name ${playerInfo.roomName}`);
+        }
+        // it will be undefined which causes error later. Could filter this
+        // map to silently ignore them.
+        return result;            
+    });
   });
 
   promise = promise.then(() => {