Fix chemplant needing catalysts on recipes that don't

src/main/java/gtPlusPlus/xmod/gregtech/common/tileentities/machines/multi/production/chemplant/GregtechMTE_ChemicalPlant.java

@@ -589,6 +589,8 @@ protected CheckRecipeResult validateRecipe(@NotNull GT_Recipe recipe) {
                     if (catalystRecipe == null || mCatalystBuses.size() != 1) {
                         return SimpleCheckRecipeResult.ofFailure("no_catalyst");
                     }
+                } else {
+                    catalystRecipe = null;
                 }
 
                 // checks if it has enough catalyst durability