fix: fixed sonarqube-reported bugs in JSON and EventBuilderTest

src/main/java/uulm/teamname/marvelous/gamelibrary/json/JSON.java

@@ -32,7 +32,7 @@ public class JSON {
         try {
             return Optional.of(mapper.readValue(input, BasicMessage.class));
         } catch (JsonProcessingException e) {
-            e.printStackTrace();
+            // e.printStackTrace();
             return Optional.empty();
         }
     }
@@ -46,7 +46,7 @@ public class JSON {
         try {
             return Optional.of(mapper.writeValueAsString(input));
         } catch (JsonProcessingException e) {
-            e.printStackTrace();
+            // e.printStackTrace();
             return Optional.empty();
         }
     }