Fix missing sapling report in tree planting

tests/test_plant_tree.py

@@ -0,0 +1,21 @@
+import unittest
+from munch import Munch
+
+from mosfet.jobs.plant_tree import PlantTreeStates
+
+
+class PlantTreeTests(unittest.TestCase):
+    def test_missing_inventory_sapling_aborts_without_crashing(self):
+        class FakeGame:
+            @staticmethod
+            def select_item(_item_ids):
+                return False
+
+        state = PlantTreeStates(Munch(
+            pos=(0, 64, 0), chopped_tree='oak', game=FakeGame()))
+        state.select_sapling()
+        self.assertIs(state.state.__func__, state.cleanup.__func__)
+
+
+if __name__ == '__main__':
+    unittest.main()