Merge changes Ia2a23bb2,I3f137e92

* changes:
  Field switching with combobox in Spline UI
  Separate field events into Field even more
diff --git a/aos/events/logging/log_cat.cc b/aos/events/logging/log_cat.cc
index 9741f70..5079606 100644
--- a/aos/events/logging/log_cat.cc
+++ b/aos/events/logging/log_cat.cc
@@ -156,6 +156,11 @@
           aos::logger::Sha256(raw_header_reader->raw_log_file_header().span()));
       full_header = raw_header_reader->log_file_header();
     }
+
+    if (!FLAGS_print) {
+      return 0;
+    }
+
     std::cout << aos::FlatbufferToJson(full_header,
                                        {.multi_line = FLAGS_pretty,
                                         .max_vector_size = static_cast<size_t>(