Merge branch 'pregmod-master' into 'pregmod-master'

Remove falsey haystacks before searching for the needle

See merge request !8120

src/js/findSlave.js

@@ -7,8 +7,8 @@ App.FindSlave = {};
  * @returns {boolean}
  */
 App.FindSlave._fragmentSearch = function(haystacks, needles) {
-	const hs = haystacks.join(" ");
-	return needles.every((needle) => { return needle.test(hs); });
+	const hs = haystacks.filter(h => !!h).join(" ");
+	return needles.every((needle) => needle.test(hs));
 };
 
 /**