Fix search to restore a feature removed permit to have only '^' and so return only filled field (so exclude empty and null fields)

Author: ddurieux

inc/search.class.php

@@ -7607,6 +7607,11 @@ static function makeTextSearchValue($val) {
             ($matches[1] != '^' ? '%' : '') .
             trim($matches[2]) .
             ($matches[3] != '$' ? '%' : '');
+      } else if (isset($matches[1])
+            && strlen(trim($matches[1])) == 1
+            && (!isset($matches[3]) || empty($matches[3]))) {
+         // this case is for search with only ^, so mean the field is not empty / not null
+         $search = '%';
       }
       return $search;
    }

tests/functionnal/Search.php

@@ -1241,7 +1241,7 @@ public function testIsInfocomOption($index, $expected) {
    protected function makeTextSearchValueProvider() {
       return [
          ['', ''],
-         ['^', ''],
+         ['^', '%'],
          ['$', ''],
          ['^$', ''],
          ['looking for', '%looking for%'],