MultiResourceItemReader executes all or none of the ItemStream methods

If no resources are found to be passed to the delegate ItemStream,
ItemStream#open is not called.  This commit updates the close side to
not call the delegate's close method if the open was not called.

BATCH-2378

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/file/MultiResourceItemReader.java

@@ -150,7 +150,11 @@ public class MultiResourceItemReader<T> extends AbstractItemStreamItemReader<T>
 	@Override
 	public void close() throws ItemStreamException {
 		super.close();
-		delegate.close();
+
+		if(!this.noInput) {
+			delegate.close();
+		}
+
 		noInput = false;
 	}