Thrimbletrimmer: Default title to blank to encourage editors to write their own

This patch simply uses the RDP tag to decide whether to use the row
description as a default for the video title, or for the video
description. This will probably be changed by #479 down the line,
but that's lower priority and more complex, so this is a good
starting point.

Resolves #504

thrimbletrimmer/scripts/edit.js

@@ -658,8 +658,12 @@ async function initializeVideoInfo() {
 	if (videoInfo.video_title) {
 		titleElem.value = videoInfo.video_title;
 	} else {
+		// If a video title hasn't been set yet, leave it blank.
+		// Exception: RDPs always use the standard title.
+		if (videoInfo.tags.includes("RDP")) {
 			titleElem.value = videoInfo.description;	
 		}
+	}
 	validateVideoTitle();
 	document.getElementById("video-info-title-abbreviated").innerText =
 		videoInfo.title_prefix + titleElem.value;
@@ -668,8 +672,12 @@ async function initializeVideoInfo() {
 	if (videoInfo.video_description) {
 		descriptionElem.value = videoInfo.video_description;
 	} else {
+		// If a video description hasn't been set yet, use the descripton from the row.
+		// Exception: RDPs start blank because the row is used for the title.
+		if (!videoInfo.tags.includes("RDP")) {
 			descriptionElem.value = videoInfo.description;
 		}
+	}
 	validateVideoDescription();
 
 	const tagsElem = document.getElementById("video-info-tags");