Fix value with anyof schema

Signed-off-by: Tyler Gu <jiaweig3@illinois.edu>

acto/input/value_with_schema.py

@@ -428,6 +428,8 @@ def get_value_by_path(self, path: list):
 
     def create_path(self, path: list):
         """Ensures the path exists"""
+        if len(path) == 0:
+            return
 
         # XXX: Complicated, no use case yet, let's implement later
         raise NotImplementedError
@@ -438,6 +440,9 @@ def set_value_by_path(self, value, path):
         else:
             self.store.set_value_by_path(value, path)
 
+    def value(self):
+        return self.store
+
 
 class ValueWithBasicSchema(ValueWithSchema):
     """Value with schema attached for Number/Integer, Bool, String"""