Describe the bug
A clear and concise description of what the bug is.

Trying to retrieve organization project boards when they are disabled causes a GHException.

To Reproduce
Steps to reproduce the behavior:

1. Disable organization project boards.
2. Use GHOrganization#listProjects()

Expected behavior
A clear and concise description of what you expected to happen.

Behavior is expected, however a boolean method would be nice.

Desktop (please complete the following information):

• OS: Windows 10
• Version: 1.126

Additional context
Add any other context about the problem here.

Add a new method GHOrganization#hasProjects(), similar to GHRepository#hasProjects() to check if projects are enabled.

This information can be retrieved from the organization json under the key has_organization_projects.