in _get_info handle i is None situation; add apijson depend apps

Author: zhangchunlin

uliweb_apijson/apijson/__init__.py

@@ -174,7 +174,8 @@ def _get_array_q(self,params):
         return q
 
     def _get_info(self,i,as_dict_child=False):
-        
+        if (not i):
+            return {}
         d = i.to_dict()
         if self.secret_fields:
             for k in self.secret_fields:

uliweb_apijson/apijson/config.ini

@@ -0,0 +1,5 @@
+[DEPENDS]
+REQUIRED_APPS = [
+    'uliweb.contrib.auth',
+    'uliweb.contrib.rbac',
+]