remove unused 'body' var; use a `finally` to clean up the temporary textfilter

src/HtmlUtils.js

@@ -136,12 +136,13 @@ module.exports = {
 
         var isHtml = (content.format === "org.matrix.custom.html");
 
-        var safeBody, body;
+        var safeBody;
         if (isHtml) {
             // XXX: We sanitize the HTML whilst also highlighting its text nodes, to avoid accidentally trying
             // to highlight HTML tags themselves.  However, this does mean that we don't highlight textnodes which
             // are interrupted by HTML tags (not that we did before) - e.g. foo<span/>bar won't get highlighted
             // by an attempt to search for 'foobar'.  Then again, the search query probably wouldn't work either
+            try {
                 if (highlights && highlights.length > 0) {
                     var highlighter = new Highlighter(isHtml, "mx_EventTile_searchHighlight", opts.onHighlightClick);
                     var safeHighlights = highlights.map(function(highlight) {
@@ -158,7 +159,10 @@ module.exports = {
                     };
                 }
                 safeBody = sanitizeHtml(content.formatted_body, sanitizeHtmlParams);
+            }
+            finally {
                 delete sanitizeHtmlParams.textFilter;
+            }
             return <span className="markdown-body" dangerouslySetInnerHTML={{ __html: safeBody }} />;
         } else {
             safeBody = content.body;