Update New Release page to send null for name

This commit updates the "New Release" page to send `null` instead of an
empty string when the "Release title" field is left blank (or is only
whitespace).

app/assets/javascripts/releases/util.js

@@ -10,13 +10,15 @@ import {
  * @param {string} createFrom The ref to create a new tag from, if necessary
  */
 export const releaseToApiJson = (release, createFrom = null) => {
+  const name = release.name?.trim().length > 0 ? release.name.trim() : null;
+
   const milestones = release.milestones ? release.milestones.map(milestone => milestone.title) : [];
 
   return convertObjectPropsToSnakeCase(
     {
+      name,
       tagName: release.tagName,
       ref: createFrom,
-      name: release.name,
       description: release.description,
       milestones,
       assets: release.assets,

spec/frontend/releases/util_spec.js

@@ -41,6 +41,24 @@ describe('releases/util.js', () => {
       });
     });
 
+    describe('release.name', () => {
+      it.each`
+        input                 | output
+        ${null}               | ${null}
+        ${''}                 | ${null}
+        ${' \t\n\r\n'}        | ${null}
+        ${'  Release name  '} | ${'Release name'}
+      `('converts a name like `$input` to `$output`', ({ input, output }) => {
+        const release = { name: input };
+
+        const expectedJson = {
+          name: output,
+        };
+
+        expect(releaseToApiJson(release)).toMatchObject(expectedJson);
+      });
+    });
+
     describe('when release.milestones is falsy', () => {
       it('includes a "milestone" property in the returned result as an empty array', () => {
         const release = {};