Merge pull request #48 from eranation/patch-1

[Minor change] Avoid a NullPointerException...

Author: sapessi

samples/spring/pet-store/src/main/java/com/amazonaws/serverless/sample/spring/StreamLambdaHandler.java

@@ -31,6 +31,7 @@ public void handleRequest(InputStream inputStream, OutputStream outputStream, Co
             } catch (ContainerInitializationException e) {
                 log.error("Cannot initialize Spring container", e);
                 outputStream.close();
+                throw new RuntimeException(e);
             }
         }