[WEEX-102][iOS] bug-fix default config center return value

 if config center can not  find any config key value , it should
return default value but just nil value.

Bug: 102


Project: http://git-wip-us.apache.org/repos/asf/incubator-weex/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-weex/commit/539c71a1
Tree: http://git-wip-us.apache.org/repos/asf/incubator-weex/tree/539c71a1
Diff: http://git-wip-us.apache.org/repos/asf/incubator-weex/diff/539c71a1

Branch: refs/heads/master
Commit: 539c71a13fce45dee933b8cc73beb5265ad33727
Parents: f77f9cc
Author: acton393 <zhangxing610...@gmail.com>
Authored: Thu Nov 16 15:37:07 2017 +0800
Committer: acton393 <zhangxing610...@gmail.com>
Committed: Thu Nov 16 15:37:07 2017 +0800

----------------------------------------------------------------------
 ios/playground/WeexDemo/WXConfigCenterDefaultImpl.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-weex/blob/539c71a1/ios/playground/WeexDemo/WXConfigCenterDefaultImpl.m
----------------------------------------------------------------------
diff --git a/ios/playground/WeexDemo/WXConfigCenterDefaultImpl.m 
b/ios/playground/WeexDemo/WXConfigCenterDefaultImpl.m
index ffb8f69..d127edb 100644
--- a/ios/playground/WeexDemo/WXConfigCenterDefaultImpl.m
+++ b/ios/playground/WeexDemo/WXConfigCenterDefaultImpl.m
@@ -39,7 +39,7 @@
     if ([keys[0] isEqualToString:@"iOS_weex_prerender_config"] && [keys[1] 
isEqualToString:@"max_cache_num"]){
         return @2;
     }
-    return nil;
+    return defaultValue;
 }
 
 @end

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