Assumptions about keys in create_blueprint fall through when using subnets

Author: WLPhoenix

stackdio/client/blueprint.py

@@ -33,7 +33,8 @@ def create_blueprint(self, blueprint, provider="ec2"):
             if isinstance(host["size"], basestring):
                 host["size"] = self.get_instance_id(host["size"], provider)
 
-            if isinstance(host["zone"], basestring):
+            # zone isn't required if you provide a subnet_id
+            if 'zone' in host and isinstance(host["zone"], basestring):
                 host["zone"] = self.get_zone_id(host["zone"], provider)
 
             if isinstance(host["cloud_profile"], basestring):