Fix keyword Error 500 bug

.gitignore

@@ -9,7 +9,6 @@
 /data
 /localconfig
 /index.html
-*.*~
 
 /skins/contrib/Dusk/admin.css
 /skins/contrib/Dusk/bug.css

Bugzilla/Search.pm

@@ -2054,12 +2054,12 @@ sub build_subselect {
     # unconditionally, so we return the subselect and let the DB optimizer
     # restrict the search based on other search criteria.
     my $not = $negate ? "NOT" : "";
-    return "$outer $not IN (SELECT DISTINCT $inner FROM `$table` WHERE $cond)";
+    return "$outer $not IN (SELECT DISTINCT $inner FROM $table WHERE $cond)";
   }
 
   # Execute subselects immediately to avoid dependent subqueries, which are
   # large performance hits on MySql
-  my $q    = "SELECT DISTINCT $inner FROM `$table` WHERE $cond";
+  my $q    = "SELECT DISTINCT $inner FROM $table WHERE $cond";
   my $dbh  = Bugzilla->dbh;
   my $list = $dbh->selectcol_arrayref($q);
   return $negate ? "1=1" : "1=2" unless @$list;
@@ -2484,7 +2484,7 @@ sub _user_nonchanged {
       my $table      = $first_join->{table};
       my $columns    = "bug_id";
       $columns .= ",isprivate" if @{$first_join->{extra}};
-      my $new_table = "SELECT DISTINCT $columns FROM `$table` AS $as $join_sql";
+      my $new_table = "SELECT DISTINCT $columns FROM $table AS $as $join_sql";
       $first_join->{table} = "($new_table)";
 
       # We always want to LEFT JOIN the generated table.