fix(github): catch 404 when committing files

lib/platform/github/storage.js

@@ -275,6 +275,7 @@ class Storage {
       logger.debug(
         `commitFilesToBranch('${branchName}', files, message, '${parentBranch})'`
       );
+      try {
         delete branchFiles[branchName];
         const parentCommit = await getBranchCommit(parentBranch);
         const parentTree = await getCommitTree(parentCommit);
@@ -291,7 +292,6 @@ class Storage {
         const tree = await createTree(parentTree, fileBlobs);
         const commit = await createCommit(parentCommit, tree, message);
         const isBranchExisting = await branchExists(branchName);
-      try {
         if (isBranchExisting) {
           await updateBranch(branchName, commit);
           logger.debug({ branch: branchName }, 'Branch updated');
@@ -305,14 +305,9 @@ class Storage {
         }
         return 'created';
       } catch (err) /* istanbul ignore next */ {
-        logger.debug({
-          files: files.filter(
-            file =>
-              !file.name.endsWith('package-lock.json') &&
-              !file.name.endsWith('npm-shrinkwrap.json') &&
-              !file.name.endsWith('yarn.lock')
-          ),
-        });
+        if (err.statusCode === 404) {
+          throw new Error('repository-changed');
+        }
         throw err;
       }
     }