Add generation of cell objects when there are no PDDL predicates associated to game object. Closes #27

Author: Vol0kin

src/main/java/controller/PlanningAgent.java

@@ -603,6 +603,11 @@ public void translateGameStateToPDDL(StateObservation stateObservation) {
                         }
                     }
                 }
+
+                this.PDDLGameStateObjects.get(this.gameInformation.cellVariable).add(
+                    String.format("%s_%d_%d", this.gameInformation.cellVariable, x, y)
+                      .replace("?", "")
+                );
             }
         }