core: try to process requests after getting a DontCloseDomain to avoid delay on processing reinjected requests

--HG--
extra : convert_revision : svn%3Ab85faa78-f9eb-468e-a121-7cced6da292c%401068

scrapy/trunk/scrapy/core/engine.py

@@ -481,6 +481,7 @@ class ExecutionEngine(object):
         try:
             dispatcher.send(signal=signals.domain_idle, sender=self.__class__, domain=domain, spider=spider)
         except DontCloseDomain:
+            self.next_request(spider)
             return
         except:
             log.exc("Exception catched on domain_idle signal dispatch")