Do not try to highlight suggestion if current value is empty, resolves #434

Prevents inserting strong tag after each character when input value is empty.

Author: Tomas Kirda

src/jquery.autocomplete.js

@@ -127,8 +127,13 @@
     $.Autocomplete = Autocomplete;
 
     Autocomplete.formatResult = function (suggestion, currentValue) {
-        var pattern = '(' + utils.escapeRegExChars(currentValue) + ')';
+        // Do not replace anything if there current value is empty
+        if (!currentValue) {
+            return suggestion.value;
+        }
 
+        var pattern = '(' + utils.escapeRegExChars(currentValue) + ')';
+
         return suggestion.value
             .replace(new RegExp(pattern, 'gi'), '<strong>$1<\/strong>')
             .replace(/&/g, '&amp;')