CCPackageHelper returning a default value instead of nothing to prevent a crash in the cocos2d-test-ios project.

Hopefully this can be solved to get the platform defines set correctly soon.

Author: NickyWeber

cocos2d/CCPackageHelper.m

@@ -15,7 +15,7 @@ + (NSString *)currentOS
     return @"Android";
 
 #endif
-    return nil;
+    return @"iOS";
 }
 
 @end