Reconnect web socket connection after server error

[dgwyer]

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name: Pull Request
about: Propose changes to the codebase
title: '[PR] '
labels: ''
assignees: ''

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Related Issue
Please link to the issue that this pull request addresses. If there isn't one, please create an issue first.

Proposed Changes
When using live reload, after a server error (e.g. triggered by a typo in your app source code) the web socket does not automatically reconnect. This PR fixes that. When the server restarts from an error the WS is automatically reconnected.

Types of changes
What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)

Checklist
Go over all the following points, and put an x in all the boxes that apply:

• My code follows the code style of this project.
• I am aware that this is an nbdev project, and I have edited, cleaned, and synced the source notebooks instead of editing .py or .md files directly.

Additional Information
Any additional information, configuration or data that might be necessary to reproduce the issue.