Workbench - Clear crafting output when there are no matching recipes

src/java/mmm/tech/base/workbench/TBWBContainer.java

@@ -168,6 +168,7 @@ public class TBWBContainer
 	private void onRecipeChanged( )
 	{
 		this.recipeDisplay.clear( );
+		this.recipeOutput.clear( );
 		if ( this.recipeWrapper == null ) {
 			// XXX log if confirm is set
 			return;