Merge pull request #263316 in DEC/fineui from release/11.0 to feature/x

* commit '2bbbdcc149e12fbf6d9693d470b96e397773079d':
  BI-143696 fix: 对象.**容错

packages/fineui/src/fix/fix.js

@@ -929,7 +929,7 @@ function watch(model, expOrFn, cb, options) {
                     return m;
                 } : parsePath(exp);
                 const v = getter.call(model, model);
-                if (v.__ob__) {
+                if (v && v.__ob__) {
                     const dep = new Dep();
                     if (isGlobal) {
                         (v.__ob__._scopeDeps || (v.__ob__._scopeDeps = [])).push(dep);