extmod: Make ujson.loads raise exception if given empty string.

Addresses issue #1097.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/extmod/ujson_loads.py b/tests/extmod/ujson_loads.py
index 05bd62a9b..75e61dacd 100644
--- a/tests/extmod/ujson_loads.py
+++ b/tests/extmod/ujson_loads.py
@@ -33,3 +33,9 @@ my_print(json.loads('{"a":[], "b":[1], "c":{"3":4}}'))
 
 # whitespace handling
 my_print(json.loads('{\n\t"a":[]\r\n, "b":[1], "c":{"3":4}     \n\r\t\r\r\r\n}'))
+
+# loading nothing should raise exception
+try:
+    json.loads('')
+except ValueError:
+    print('ValueError')