Fix uploading empty files

Author: CompuIves

packages/app/src/app/overmind/namespaces/files/internalActions.ts

@@ -99,7 +99,7 @@ export const uploadFiles: AsyncAction<
             file.type === 'application/json') &&
           dataURI.length < MAX_FILE_SIZE
         ) {
-          const text = atob(dataURI.replace(/^.*base64,/, ''));
+          const text = dataURI ? atob(dataURI.replace(/^.*base64,/, '')) : '';
           parsedFiles[filePath] = {
             content: text,
             isBinary: false,