Fixed unused variables.

Author: Giorgi Lomia

tools/graph-stats/graph-memory-stats.cpp

@@ -297,34 +297,64 @@ doMemoryAnalysis(const std::unique_ptr<katana::PropertyGraph> graph) {
   auto basic_raw_json_res = SaveToJson(
       katana::JsonDump(basic_raw_stats), outputfilename,
       "basic_raw_stats.json");
+  KATANA_LOG_VASSERT(
+      basic_raw_json_res, "unexpected errror {}", basic_raw_json_res.error());
 
   auto all_node_prop_json_res = SaveToJson(
       katana::JsonDump(all_node_prop_stats), outputfilename,
       "node_prop_stats.json");
+  KATANA_LOG_VASSERT(
+      all_node_prop_json_res, "unexpected errror {}",
+      all_node_prop_json_res.error());
+
   auto all_node_width_json_res = SaveToJson(
       katana::JsonDump(all_node_width_stats), outputfilename,
       "node_width_stats.json");
+  KATANA_LOG_VASSERT(
+      all_node_width_json_res, "unexpected errror {}",
+      all_node_width_json_res.error());
 
   auto all_edge_prop_json_res = SaveToJson(
       katana::JsonDump(all_edge_prop_stats), outputfilename,
       "edge_prop_stats.json");
+  KATANA_LOG_VASSERT(
+      all_edge_prop_json_res, "unexpected errror {}",
+      all_edge_prop_json_res.error());
+
   auto all_edge_width_json_res = SaveToJson(
       katana::JsonDump(all_edge_width_stats), outputfilename,
       "edge_width_stats.json");
+  KATANA_LOG_VASSERT(
+      all_edge_width_json_res, "unexpected errror {}",
+      all_edge_width_json_res.error());
 
   auto all_node_alloc_json_res = SaveToJson(
       katana::JsonDump(all_node_alloc), outputfilename,
       "default_node_alloc.json");
+  KATANA_LOG_VASSERT(
+      all_node_alloc_json_res, "unexpected errror {}",
+      all_node_alloc_json_res.error());
+
   auto all_edge_alloc_json_res = SaveToJson(
       katana::JsonDump(all_edge_alloc), outputfilename,
       "default_edge_alloc.json");
+  KATANA_LOG_VASSERT(
+      all_edge_width_json_res, "unexpected errror {}",
+      all_edge_width_json_res.error());
 
   auto all_node_usage_json_res = SaveToJson(
       katana::JsonDump(all_node_usage), outputfilename,
       "grouping_node_usage.json");
+  KATANA_LOG_VASSERT(
+      all_edge_width_json_res, "unexpected errror {}",
+      all_edge_width_json_res.error());
+
   auto all_edge_usage_json_res = SaveToJson(
       katana::JsonDump(all_edge_usage), outputfilename,
       "grouping_edge_usage.json");
+  KATANA_LOG_VASSERT(
+      all_edge_width_json_res, "unexpected errror {}",
+      all_edge_width_json_res.error());
 }
 
 int