import/export: On export error return 500 instead of crashing

src/tests/backend/specs/export.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const common = require('../common');
+const padManager = require('../../../node/db/PadManager');
+const settings = require('../../../node/utils/Settings');
+
+describe(__filename, function () {
+  let agent;
+  const settingsBackup = {};
+
+  before(async function () {
+    agent = await common.init();
+    settingsBackup.soffice = settings.soffice;
+    await padManager.getPad('testExportPad', 'test content');
+  });
+
+  after(async function () {
+    Object.assign(settings, settingsBackup);
+  });
+
+  it('returns 500 on export error', async function () {
+    settings.soffice = 'false'; // '/bin/false' doesn't work on Windows
+    await agent.get('/p/testExportPad/export/doc')
+        .expect(500);
+  });
+});