`gatsby-source-contentful` returns a string with a single whitespace character (`" "`) for empty "long text" fields

Description

gatsby-source-contentful returns a string with a single whitespace character (" ") for empty “long text” fields, rather than an empty string (""), or null like other fields. Seems to be fine and returns null for empty “short text” fields.

It looks like the problem stems is on this line, though not sure if this space is there for a reason or not 🤔 - haven’t had time to investigate that thoroughly yet.

Steps to reproduce

1. Create new Gatsby project
2. Install and configure gatsby-source-contentful
3. Create an entry in Contentful with a “long text” field
4. Leave “long text” field empty
5. Run Gatsby site and query the entry/field in GraphiQL editor

Expected result

"description": null

is returned

Actual result

"description": {
  "description": " "
}

is returned

Environment

Run gatsby info --clipboard in your project directory and paste the output here.

  System:
    OS: macOS 10.15.2
    CPU: (8) x64 Intel(R) Core(TM) i5-8279U CPU @ 2.40GHz
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 10.16.2 - /var/folders/c6/zn3s5lkd09xf78n8tcylhyg00000gn/T/yarn--1578935140235-0.22327134046771624/node
    Yarn: 1.21.1 - /var/folders/c6/zn3s5lkd09xf78n8tcylhyg00000gn/T/yarn--1578935140235-0.22327134046771624/yarn
    npm: 6.13.4 - /usr/local/bin/npm
  Languages:
    Python: 2.7.16 - /usr/bin/python
  Browsers:
    Chrome: 79.0.3945.117
    Firefox: 72.0.1
    Safari: 13.0.4
  npmPackages:
    gatsby: 2.16.3 => 2.16.3 
    gatsby-image: 2.2.29 => 2.2.29 
    gatsby-plugin-react-helmet: 3.1.11 => 3.1.11 
    gatsby-plugin-segment-js: 3.0.1 => 3.0.1 
    gatsby-plugin-styled-components: 3.1.14 => 3.1.14 
    gatsby-plugin-typescript: 2.1.12 => 2.1.12 
    gatsby-source-contentful: 2.1.47 => 2.1.47 

[mrseanbaines]

Awesome! I can do that 🙌

[github-actions[bot]]

Hiya!

This issue has gone quiet. Spooky quiet. 👻

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