[Telemetry] Improve logging on media measurement tests.

tools/perf/page_sets/tough_video_cases/video.html

Index: tools/perf/page_sets/tough_video_cases/video.html
diff --git a/tools/perf/page_sets/tough_video_cases/video.html b/tools/perf/page_sets/tough_video_cases/video.html
index 2c7c9a08a38db4ff1ae384f7e52eba674523420c..e7e0334ece5a542377eccf3390aa80bb5ab2d8f9 100644
--- a/tools/perf/page_sets/tough_video_cases/video.html
+++ b/tools/perf/page_sets/tough_video_cases/video.html
@@ -25,9 +25,9 @@
      return params;
     }
     qsParams = getQueryStrings();
-    if (qsParams["type"] != "") {
+    if (qsParams["type"]) {
       testElement = document.createElement(qsParams["type"]);
-      if (qsParams["id"] != "")
+      if (qsParams["id"])
         testElement.id = qsParams["id"];
       testElement.src = qsParams["src"];
       testElement.controls = true;