feat: added validation to ScenarioConfig

src/main/java/uulm/teamname/marvelous/gamelibrary/config/ScenarioConfig.java

@@ -1,5 +1,7 @@
 package uulm.teamname.marvelous.gamelibrary.config;
 
+import jakarta.validation.constraints.NotEmpty;
+
 import java.util.Arrays;
 import java.util.Objects;
 
@@ -8,12 +10,15 @@ import java.util.Objects;
  */
 public class ScenarioConfig {
     /** An array containing the map based on the {@link FieldType} enum. So, ROCK and GRASS basically. */
+    @NotEmpty
     public FieldType[][] scenario;
 
     /** A string containing the name of the author of the scenario config */
+    @NotEmpty
     public String author;
 
     /** A string containing the name of the scenario configuration (so basically the map title) */
+    @NotEmpty
     public String name;
 
     @Override