More PowerEntry work.

src/engine/wpak/data/PowerEntry.java

@@ -42,7 +42,7 @@ public class PowerEntry {
     public mbEnums.CompoundCurveType hateCurve;
     public int loopAnimID;
     public String grantOverrideVar;
-    public ArrayList<String> description;
+    public ArrayList<String> description = new ArrayList<>();
     public String slopeType;
     public mbEnums.CompoundCurveType curve;
     public String category;