fix: improve support for random objects with grid, master view

thus far we expected either dict or "native" ORM object which can
essentially behave like a dict when needed.  but a "non-native" object
may not behave like a dict and this hopefully fixes the logic to allow
for those anyway..

tests/grids/test_base.py

@@ -1373,6 +1373,25 @@ class TestGrid(WebTestCase):
         filters = grid.get_vue_filters()
         self.assertEqual(len(filters), 2)
 
+    def test_object_to_dict(self):
+        grid = self.make_grid()
+        setting = {'name': 'foo', 'value': 'bar'}
+
+        # new dict but with same values
+        dct = grid.object_to_dict(setting)
+        self.assertIsInstance(dct, dict)
+        self.assertIsNot(dct, setting)
+        self.assertEqual(dct, setting)
+
+        # random object, not iterable
+        class MockSetting:
+            def __init__(self, **kw):
+                self.__dict__.update(kw)
+        mock = MockSetting(**setting)
+        dct = grid.object_to_dict(mock)
+        self.assertIsInstance(dct, dict)
+        self.assertEqual(dct, setting)
+
     def test_get_vue_context(self):
 
         # empty if no columns defined