combogrid __queryValue param null

src/controls/input/combogrid.js

@@ -281,7 +281,7 @@ export default function () {
         reloadGrid() {
             // 展开时，根据 lookup 带入查询参数
             const expressData = this.getExpressData()
-            const reloadParam = calcObjectFlat(expressData, this.param)
+            const reloadParam = calcObjectFlat(expressData, this.param) || {}
 
             const txtField = this.grid.down('toolbar').down('textfield')