[itemloader-errors] reordered method

#3836

scrapy/loader/__init__.py

@@ -136,7 +136,6 @@ class ItemLoader(object):
         except Exception as e:
             raise ValueError("Error with output processor: field=%r value=%r error='%s: %s'" % \
                 (field_name, self._values[field_name], type(e).__name__, str(e)))
-        return proc
 
     def get_collected_values(self, field_name):
         return self._values[field_name]

scrapy/loader/processors.py

@@ -32,6 +32,7 @@ class MapCompose(object):
                                      "function %s value=%r error='%s: %s'" %
                                      (func.__name__, value,
                                       type(e).__name__, str(e)))
+            values = next_values
         return values