fix

examcloud-core-questions-service/src/main/java/cn/com/qmth/examcloud/core/questions/service/impl/RandomPaperServiceImpl.java

@@ -997,6 +997,9 @@ public class RandomPaperServiceImpl implements RandomPaperService {
 	}
 
 	private Integer[] getOption(Integer count) {
+		if(count==null) {
+			return null;
+		}
 		Integer[] ret = new Integer[count];
 		for (int i = 0; i < count; i++) {
 			ret[i] = i;