fix(release): check that file.content is not empty

Author: e11sy

workers/release/src/index.ts

@@ -282,6 +282,10 @@ export default class ReleaseWorker extends Worker {
    */
   private saveFile(file: SourceMapDataExtended): Promise<SourceMapFileChunk> {
     return new Promise((resolve, reject) => {
+      if (!file.content) {
+        return reject(new Error('Source map content is empty'));
+      }
+
       const readable = Readable.from([ file.content ]);
       const writeStream = this.db.getBucket().openUploadStream(file.mapFileName);