Gatsby plugin image required #127
Description
With PR #123 (https://github.com/contentstack/gatsby-source-contentstack/pull/123/files#diff-6d7a97f0e776f3de4a5359346231cd4ce6b76c437f8a414cecf918f23dfe9e62R45-R49) there is a new requirement for users to install additional plugins, even if they were not using those features.
This change was published as a patch version 3.1.1.
While i really appreciate the support to add these new features, having a patch upgrade fail builds and require new plugins feel bad.
Instead of a panic, could the feature just return the empty object. (Similar to if its not an asset originally).
Context error message
11:37:56 error Gatsby plugin image is required. Please check https://github.com/contentstack/gatsby-source-contentstack#the-new-gatsby-image-plugin for more help.
11:37:56
11:37:56
11:37:56 Error: Cannot find module 'gatsby-plugin-image/graphql-utils'
11:37:56 Require stack:
11:37:56 - /home/jenkins/workspace/node_modules/gatsby-source-contentstack/extend-node-type.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby-source-contentstack/gatsby-node.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/bootstrap/load-plugins/validate.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/bootstrap/load-plugins/load.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/bootstrap/load-plugins/index.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/bootstrap/load-config-and-plugins.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/services/initialize.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/services/index.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/bootstrap/index.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/commands/build.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/node_modules/gatsby-cli/lib/create-cli.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/node_modules/gatsby-cli/lib/index.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/dist/bin/gatsby.js
11:37:56 - /home/jenkins/workspace/node_modules/gatsby/cli.js