Rework of error handling.

src/engine/gameManager/ForgeManager.java

@@ -36,10 +36,20 @@ public enum ForgeManager implements Runnable {
 
         while (true) {
 
-            try {
+            WorkOrder workOrder = null;
-                WorkOrder workOrder = forge.take();
 
-                // Completed or canceled work orders are not re-enqueued
+            try {
+                workOrder = forge.take();
+            } catch (InterruptedException e) {
+                Logger.error(e);
+            }
+
+            if (workOrder == null) {
+                Logger.error("NULL workOrder in queue");
+                continue;
+            }
+
+            // Completed or canceled work orders are not re-enqueued
 
                 if (workOrder.runCanceled || workOrder.runCompleted)
                     continue;
@@ -72,10 +82,6 @@ public enum ForgeManager implements Runnable {
                 workOrder.completionTime = System.currentTimeMillis() + workOrder.rollingDuration;
                 forge.add(workOrder);
                 Logger.info(workOrder.toString());
-
-            } catch (InterruptedException e) {
-                e.printStackTrace();
-            }
         }
     }