Properly display histogram if timestamps are not enabled on server

packet-exchange/src/server.c

@@ -254,6 +254,7 @@ static void print_histograms() {
 
   interval = param->interval / 1000;
 
+  if(enable_timestamps) {
     printf("{\"measure_sets\": [{"
                "\"measure_type\": \"packet_recv_timestamps\","
                "\"props_names\": [\"user_space\", \"kernel_space\"],"
@@ -276,6 +277,7 @@ static void print_histograms() {
         printf("%" PRIi64 "%s", histograms[i][j], (j + 1 < max_hist_val ? ", " : ""));
       printf("%s", (i + 1 < 2 ? "], " : "]"));
     }
+  }
 
   max_hist_val = 0;
   for (int j = 0; j < MAX_HIST_VAL; j++)
@@ -286,8 +288,12 @@ static void print_histograms() {
     if(histograms[2][j])
       min_hist_val = j;
 
-  printf(   "]}, {"
-             "\"measure_type\": \"packet_jitter\","
+  if(!enable_timestamps)
+    printf("{\"measure_sets\": [{");
+  else
+    printf(   "]}, {");
+
+  printf(    "\"measure_type\": \"packet_jitter\","
              "\"props_names\": [\"jitter\"],"
              "\"units\": [\"us\"],"
              "\"props_type\": \"histogram\","