[bugfix] Fix error extracting status content: no content found (#598)

* don't return error if no content found in Activity

* add test for content extraction

* go fmt

internal/ap/extractcontent_test.go

@@ -0,0 +1,42 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package ap_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
+)
+
+type ExtractContentTestSuite struct {
+	ExtractTestSuite
+}
+
+func (suite *ExtractContentTestSuite) TestExtractContent1() {
+	note := suite.noteWithMentions1
+
+	content := ap.ExtractContent(note)
+
+	suite.Equal("hey @f0x and @dumpsterqueer", content)
+}
+
+func TestExtractContentTestSuite(t *testing.T) {
+	suite.Run(t, &ExtractContentTestSuite{})
+}