Don’t show commit details when none present (#311)

Fixes #308

lib/config/templates/group-pr-body.hbs

@@ -7,10 +7,11 @@ This {{#if isGitHub}}Pull{{else}}Merge{{/if}} Request renovates the package grou
 ### Commits
 
 {{#each upgrades as |upgrade|}}
+{{#if upgrade.releases.length}}
 <details>
 <summary>{{upgrade.githubName}}</summary>
-
 {{#each upgrade.releases as |release|}}
+
 #### {{release.version}}
 {{#each release.commits as |commit|}}
 -   [`{{commit.shortSha}}`]({{commit.url}}){{commit.message}}
@@ -18,9 +19,9 @@ This {{#if isGitHub}}Pull{{else}}Merge{{/if}} Request renovates the package grou
 {{/each}}
 
 </details>
+{{/if}}
 {{/each}}
 
-<br />
 <br />
 
 This {{#if isGitHub}}PR{{else}}MR{{/if}} has been generated by [Renovate Bot](https://keylocation.sg/our-tech/renovate).

lib/config/templates/pr-body.hbs

 This {{#if isGitHub}}Pull{{else}}Merge{{/if}} Request updates dependency [{{depName}}]({{repositoryUrl}}) from version `{{currentVersion}}` to `{{newVersion}}`
+{{#if releases.length}}
 
 ### Commits
 
@@ -13,8 +14,7 @@ This {{#if isGitHub}}Pull{{else}}Merge{{/if}} Request updates dependency [{{depN
 {{/each}}
 
 </details>
-
-<br />
+{{/if}}
 <br />
 
 This {{#if isGitHub}}PR{{else}}MR{{/if}} has been generated by [Renovate Bot](https://keylocation.sg/our-tech/renovate).

test/workers/__snapshots__/pr.spec.js.snap

+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`workers/pr ensurePr(upgrades) should return unmodified existing PR 1`] = `Array []`;

test/workers/pr.spec.js

@@ -99,8 +99,6 @@ describe('workers/pr', () => {
 -   [\`abcdefg\`](https://github.com/renovateapp/dummy/commit/abcdefghijklmnopqrstuvwxyz)foo [#3](https://github.com/renovateapp/dummy/issues/3)
 
 </details>
-
-<br />
 <br />
 
 This PR has been generated by [Renovate Bot](https://keylocation.sg/our-tech/renovate).`,
@@ -191,6 +189,7 @@ This PR has been generated by [Renovate Bot](https://keylocation.sg/our-tech/ren
       config.api.getBranchPr = jest.fn(() => existingPr);
       config.api.updatePr = jest.fn();
       const pr = await prWorker.ensurePr([config]);
+      expect(config.api.updatePr.mock.calls).toMatchSnapshot();
       expect(config.api.updatePr.mock.calls.length).toBe(0);
       expect(pr).toMatchObject(existingPr);
     });