Handle no job group filter matches gracefully

lib/OpenQA/WebAPI/Controller/Test.pm

@@ -719,9 +719,8 @@ sub _prepare_job_results ($self, $all_jobs, $limit) {
 }
 
 sub _prepare_groupids ($self) {
-    if (my @groups = $self->groups_for_globs) {
-        return [map { $_->id } @groups];
-    }
+    return [0] unless my $groups = $self->groups_for_globs;
+    return [map { $_->id } @$groups] if @$groups;
 
     my $v = $self->validation;
     $v->optional('groupid')->num(0, undef);

lib/OpenQA/WebAPI/Plugin/Helpers.pm

@@ -439,7 +439,11 @@ sub _compose_job_overview_search_args ($c) {
         @groups = $schema->resultset('JobGroups')->search(\@search_terms)->all;
     }
 
-    else { @groups = $c->groups_for_globs }
+    else {
+        my $groups = $c->groups_for_globs;
+        if (defined $groups) { @groups = @$groups }
+        else { $search_args{groupids} = [0] }
+    }
 
     # add flash message if optional "groupid" parameter is invalid
     $c->stash(flash_error => 'Specified "groupid" is invalid and therefore ignored.')
@@ -503,9 +507,12 @@ sub _groups_for_globs ($c) {
         @groups = $c->schema->resultset('JobGroups')->all;
         @groups = grep { _match_group(\@inclusive, $_) } @groups if @inclusive;
         @groups = grep { !_match_group(\@exclusive, $_) } @groups if @exclusive;
+
+        # No matches at all needs to be a special case to be handled gracefully by the caller
+        return undef unless @groups;
     }
 
-    return @groups;
+    return \@groups;
 }
 
 sub _match_group ($regexes, $group) {

t/ui/02-list-group.t

@@ -144,6 +144,13 @@ subtest 'group_glob and not_group_glob' => sub {
         is @rows, 1, 'one job';
         ok $driver->find_element('#results #job_99953'), '99953 listed';
     };
+
+    subtest 'filter with glob and no match' => sub {
+        ok $driver->get('/tests?group_glob=does_not_exist'), 'list jobs';
+        wait_for_ajax(msg => 'wait for test list');
+        my @rows = $driver->find_child_elements($driver->find_element('#results tbody'), 'tr');
+        like $rows[0]->get_text, qr/No data available in table/, 'no results';
+    };
 };
 
 kill_driver;

t/ui/10-tests_overview.t

@@ -533,6 +533,11 @@ subtest 'filtering by job group' => sub {
         my $text = $get_text->('/tests/overview?group_glob=*opensuse*,*SLE*&not_group_glob=*development*');
         like $text, qr/Summary of opensuse, opensuse test, SLE 15 SP5 build/, 'job group match';
     };
+
+    subtest 'filter with glob and no match' => sub {
+        my $text = $get_text->('/tests/overview?group_glob=does_not_exist');
+        like $text, qr/Overall Summary of multiple distri\/version/, 'no match';
+    };
 };
 
 subtest "job template names displayed on 'Test result overview' page" => sub {