Merge PR #2825 by @Parygind - harden against malformed JSON

Author: Cervator

engine/src/main/java/org/terasology/engine/modes/loadProcesses/PostBeginSystems.java

@@ -15,20 +15,27 @@
  */
 package org.terasology.engine.modes.loadProcesses;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.terasology.context.Context;
 import org.terasology.engine.ComponentSystemManager;
 import org.terasology.entitySystem.systems.ComponentSystem;
 
 import java.util.Iterator;
+import java.util.NoSuchElementException;
 
 /**
  */
 public class PostBeginSystems extends StepBasedLoadProcess {
 
+    private static final Logger logger = LoggerFactory.getLogger(PostBeginSystems.class);
+
     private final Context context;
 
     private Iterator<ComponentSystem> componentSystems;
 
+    private ComponentSystem currentSystem;
+
     public PostBeginSystems(Context context) {
         this.context = context;
     }
@@ -41,7 +48,12 @@ public String getMessage() {
     @Override
     public boolean step() {
         if (componentSystems.hasNext()) {
-            componentSystems.next().postBegin();
+            try {
+                currentSystem = componentSystems.next();
+                currentSystem.postBegin();
+            } catch (NoSuchElementException e) {
+                logger.error("Failed to load system : '" + currentSystem.toString() + "'");
+            }
         }
         return !componentSystems.hasNext();
     }