fix(ncform): fixed crach when only number items in array

fix #150

packages/ncform-common/src/ncform-utils.js

@@ -523,7 +523,7 @@ const ncformUtils = {
         break;
       case "number":
       case "integer":
-        defVal = undefined; // 数字默认值不好给，所以这里给undefined
+        defVal = ""; // 数字默认值不好给，所以这里给undefined
         break;
       case "boolean":
         defVal = false;

packages/ncform-e2e/ncform/cypress/integration/examples/layoutWidgets.spec.js

@@ -140,4 +140,12 @@ context('Layout widgets', () => {
     })
   })
 
+  it('array: with number items', () => {
+    let id = md5('array: with number items');
+    cy.get(`[data-cy=${id}]`).within(() => {
+      cy.get('legend').contains('user').as('userLegend');
+      cy.get('@userLegend').parent().find('button').contains('Add').click();
+    })
+  })
+
 })