Remove falsey haystacks before searching for the needle. Prevents slaves...

Remove falsey haystacks before searching for the needle.  Prevents slaves without surnames from matching the query "name is like 0".

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));
 };
 
 /**