Exception raised on 'rasa init' when trying to speak to assistant
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**Rasa version**: `master` branch

**Rasa X version** (if used & relevant): -

**Python version**: 3.7.4

**Operating system** (windows, osx, ...): macOS

**Issue**:
After running `rasa init` and after the model is trained for the first time, the user is prompted with:
```
? Do you want to speak to the trained assistant on the command line? 🤖
```
If the user answers 'Yes', the script crashes with an exception.

**Error (including full traceback)**:
```
Traceback (most recent call last):
  File "/Users/federico/Workspace/rasa-x/env/bin/rasa", line 11, in <module>
    load_entry_point('rasa', 'console_scripts', 'rasa')()
  File "/Users/federico/Workspace/rasa/rasa/__main__.py", line 76, in main
    cmdline_arguments.func(cmdline_arguments)
  File "/Users/federico/Workspace/rasa/rasa/cli/scaffold.py", line 194, in run
    init_project(args, path)
  File "/Users/federico/Workspace/rasa/rasa/cli/scaffold.py", line 112, in init_project
    print_train_or_instructions(args, path)
  File "/Users/federico/Workspace/rasa/rasa/cli/scaffold.py", line 52, in print_train_or_instructions
    print_run_or_instructions(args, path)
  File "/Users/federico/Workspace/rasa/rasa/cli/scaffold.py", line 90, in print_run_or_instructions
    shell(args)
  File "/Users/federico/Workspace/rasa/rasa/cli/shell.py", line 101, in shell
    rasa.cli.run.run(args)
  File "/Users/federico/Workspace/rasa/rasa/cli/run.py", line 99, in run
    if args.remote_storage is not None:
AttributeError: 'Namespace' object has no attribute 'remote_storage'
```

**Command or request that led to error**:
```
rasa init
```

**Content of configuration file (config.yml)** (if relevant): created by `rasa init`

**Content of domain file (domain.yml)** (if relevant): created by `rasa init`

diff --git a/rasa/cli/scaffold.py b/rasa/cli/scaffold.py
index a9062dc426e..5b0ebb9a8be 100644
--- a/rasa/cli/scaffold.py
+++ b/rasa/cli/scaffold.py
@@ -81,6 +81,7 @@ def print_run_or_instructions(args: argparse.Namespace, path: Text) -> None:
             "jwt_secret",
             "jwt_method",
             "enable_api",
+            "remote_storage",
         ]
         for a in attributes:
             setattr(args, a, None)
['rasa/cli/scaffold.py']