diag null 值判断

graph-web/src/main/java/org/diagbot/graphWeb/work/GraphCalculate.java

@@ -290,10 +290,10 @@ public class GraphCalculate {
                 }
             }
         }
-        if(webDiagList.length>0){
+        if(webDiagList!=null && webDiagList.length>0){
             for (String wd:webDiagList
                  ) {
-                if(!disName.equals(wd)){
+                if(wd != null && !disName.equals(wd)){
                     fildName = "'"+wd+"'";
                     if(!exculdDiagFilds.contains(fildName)){
                         exculdDiagFilds.add(fildName);