修复精准组卷bug

cqb-paper/src/main/java/com/qmth/cqb/paper/dto/PaperDetailExp.java

@@ -89,6 +89,8 @@ public class PaperDetailExp implements Serializable,Comparable<PaperDetailExp>{
     @Override
     public int compareTo(PaperDetailExp paperDetailExp) {
         if (paperDetailExp != null) {
+            if(this.getNumber() == null)return -1;
+            if(paperDetailExp.getNumber() == null)return 1;
             if (this.getNumber() > paperDetailExp.getNumber()) {
                 return 1;
             } else if (this.getNumber() < paperDetailExp.getNumber()) {