Merge pull request #12 from Globegitter/patch-2

Catch ImportError for iterate_promise

promise/compat.py

@@ -13,6 +13,6 @@ def iscoroutine(obj):
 
 try:
     from .iterate_promise import iterate_promise
-except SyntaxError:
+except (SyntaxError, ImportError):
     def iterate_promise(promise):
         raise Exception('You need "yield from" syntax for iterate in a Promise.')