Fix error when the filtered datum is not iterable

jsonpath_rw_ext/_filter.py

@@ -38,6 +38,9 @@ class Filter(jsonpath_rw.JSONPath):
             return datum
 
         datum = jsonpath_rw.DatumInContext.wrap(datum)
+        if not isinstance(datum.value, list):
+            return []
+
         return [jsonpath_rw.DatumInContext(datum.value[i],
                                            path=jsonpath_rw.Index(i),
                                            context=datum)

jsonpath_rw_ext/tests/test_jsonpath_rw_ext.py

@@ -238,6 +238,17 @@ class TestJsonpath_rw_ext(testscenarios.WithScenarios,
             target=["cat-bow"]
         )),
 
+        ('bug-#2-correct', dict(
+            string='foo[?(@.baz==1)]',
+            data={'foo': [{'baz': 1}, {'baz': 2}]},
+            target=[{'baz': 1}],
+        )),
+
+        ('bug-#2-wrong', dict(
+            string='foo[*][?(@.baz==1)]',
+            data={'foo': [{'baz': 1}, {'baz': 2}]},
+            target=[],
+        )),
     ]
 
     def test_fields_value(self):