Merge pull request cryptonomex#616 from bitshares/615-fix-fee-refund-…

…test

 Market his: make _meta local, fix fee_refund test

libraries/plugins/market_history/market_history_plugin.cpp

@@ -63,8 +63,6 @@ class market_history_plugin_impl
       uint32_t                   _maximum_history_per_bucket_size = 1000;
       uint32_t                   _max_order_his_records_per_market = 1000;
       uint32_t                   _max_order_his_seconds_per_market = 259200;
-
-      const market_ticker_meta_object* _meta = nullptr;
 };
 
 
@@ -299,6 +297,10 @@ market_history_plugin_impl::~market_history_plugin_impl()
 void market_history_plugin_impl::update_market_histories( const signed_block& b )
 {
    graphene::chain::database& db = database();
+   const market_ticker_meta_object* _meta = nullptr;
+   const auto& meta_idx = db.get_index_type<simple_index<market_ticker_meta_object>>();
+   if( meta_idx.size() > 0 )
+      _meta = &( *meta_idx.begin() );
    const vector<optional< operation_history_object > >& hist = db.get_applied_operations();
    for( const optional< operation_history_object >& o_op : hist )
    {