NullPointer Exception when fetching Newcastle

Fix: Newcastle UK -> Newcastle GB

```
diff --git a/src/main/java/org/infinispan/tutorial/embedded/WeatherApp.java b/src/main/java/org/infinispan/tutorial/embedded/WeatherApp.java
index cc029b8..02973ce 100644
--- a/src/main/java/org/infinispan/tutorial/embedded/WeatherApp.java
+++ b/src/main/java/org/infinispan/tutorial/embedded/WeatherApp.java
@@ -6,7 +6,7 @@ import org.infinispan.manager.EmbeddedCacheManager;
public class WeatherApp {

static final String[] locations = { "Rome, Italy", "Como, Italy", "Basel, Switzerland", "Bern, Switzerland",
- "London, UK", "Newcastle, UK", "Bucarest, Romania", "Cluj-Napoca, Romania", "Ottawa, Canada",
+ "London, UK", "Newcastle, GB", "Bucarest, Romania", "Cluj-Napoca, Romania", "Ottawa, Canada",
"Toronto, Canada", "Lisbon, Portugal", "Porto, Portugal", "Raleigh, USA", "Washington, USA" };
private final EmbeddedCacheManager cacheManager;
private final WeatherService weatherService;
```

Open src/main/java/org/infinispan/tutorial/embedded/WeatherApp.java and inspect the locations array used when fetching weather. Change the Newcastle location from UK to GB, then run the tutorial or its available checks and confirm fetching Newcastle no longer causes a NullPointerException.

Written by the indexing model from the issue text.