Hotfix for null checking `ToState`. (#244)

UOP1_Project/Assets/Scripts/StateMachine/Editor/TransitionTableEditor.cs

 				var serializedTransition = new SerializedTransition(_transitions, i);
 				if (serializedTransition.FromState.objectReferenceValue == null)
 				{
-					Debug.LogError("Transition with invalid state found in table " + serializedObject.targetObject.name + ", deleting...");
+					Debug.LogError("Transition with invalid \"From State\" found in table " + serializedObject.targetObject.name + ", deleting...");
-				if (serializedTransition.FromState.objectReferenceValue == null)
+				if (serializedTransition.ToState.objectReferenceValue == null)
-					Debug.LogError("Transition with invalid state found in table " + serializedObject.targetObject.name + ", deleting...");
+					Debug.LogError("Transition with invalid \"Target State\" found in table " + serializedObject.targetObject.name + ", deleting...");
 					_transitions.DeleteArrayElementAtIndex(i);
 					serializedObject.ApplyModifiedProperties();
 					Reset();