Fix Web IDE renaming empty content

In the Web IDE when you rename a file
you loose chnages made inside that
file on commit. We fix that by
removing a null condition from the
commit payload.

Changelog: fixed

app/assets/javascripts/ide/stores/utils.js

@@ -117,7 +117,7 @@ export const createCommitPayload = ({
       action: commitActionForFile(f),
       file_path: f.path,
       previous_path: f.prevPath || undefined,
-      content: f.prevPath && !f.changed ? null : content || undefined,
+      content: content || undefined,
       encoding: isBlob ? 'base64' : 'text',
       last_commit_id: newBranch || f.deleted || f.prevPath ? undefined : f.lastCommitSha,
     };

spec/frontend/ide/stores/utils_spec.js

@@ -94,7 +94,7 @@ describe('Multi-file store utils', () => {
           {
             action: commitActionTypes.move,
             file_path: 'renamedFile',
-            content: null,
+            content: undefined,
             encoding: 'text',
             last_commit_id: undefined,
             previous_path: 'prevPath',