Crash during error reporting

[ehmicky]

The build currently crashes when the following conditions are all met:

• The build failed
• The build was run in CI (not locally)
• The build failed due to a plugin
• The Build plugin is not a local plugin
• The Build plugin has no repository field in their package.json

Bugsnag error.

[ehmicky]

This issue has been linked to an error in Bugsnag
TypeError in src/error/parse/plugin.js:47

[ehmicky]

Core bug

Comment added in Bugsnag by Mickael Hebert
TypeError in src/error/parse/plugin.js:47

[ehmicky]

An error linked to this issue has been marked as fixed in Bugsnag
TypeError in src/error/parse/plugin.js:47

[ehmicky]

Fixed by #1723.