tooltipise.js: Fix `$('.load-more-text') === undefined

When there is no '.load-more-text' element on the page, a JavaScript
error would be triggered from calling `addEventListener` on `undefined`.
Do a check for undefined to silence the error.

1 files changed, 6 insertions, 3 deletions

diff --git a/tooltipise.js b/tooltipise.js
index 6331739..66f9bb5 100644
--- a/tooltipise.js
+++ b/tooltipise.js
@@ -11,7 +11,10 @@
 	tooltipise_titles();
 	
 	// Refresh titles when more videos are loaded
-	document.querySelector('.load-more-text').addEventListener('click', function() {
-		window.setTimeout(tooltipise_titles, 3000);
-	});
+	var load_more_button = document.querySelector('.load-more-text');
+	if (load_more_button) {
+		load_more_button.addEventListener('click', function() {
+			window.setTimeout(tooltipise_titles, 3000);
+		});
+	}
 })()