The converters should be adjusted to prevent errors

[schettn]

Describe the feature or change you'd like
Currently the converters can crash if some specific data is not available. This breaks the whole intel.append() process.

Note to myself: Fix this.

Additional context
Ref: https://github.com/snek-at/intel/blob/implement-1/src/utils/github/converter.ts
Ref: https://github.com/snek-at/intel/blob/implement-1/src/utils/gitlab/converter.ts