Issue Summary

Very rare case which root cause is unknown yet. 
Every hour DVCS poll current repositories list assigned to linked organisation.
DVCS uses GET /api/v3/organizations/{id}/repos?per_page={page_size}&page={page_number} url to get list of repositories.

Very rare, but it happens that response JSON object contains null value.

[{repoObject},
 ...
 {repoObject},
 null,
 {repoObject},
 ...
 {repoObject}
] 

DVCS code is not prepared for handling such response.
In effect synchronisation process fails.
For specific organisations it might appear that 

This is reproducible on Data Center: yes

Steps to Reproduce

It's unknown how to reproduce that issue. DVCS doesn't retrieve any metadata which might help understand root cause.

Expected Results

DVCS should handle such scenario and keep repositories updated with git.

Actual Results

We can spot that situation in logs with search:

2023-07-04 22:05:03,172-0700 Caesium-1-3 INFO ServiceRunner     [c.a.j.p.dvcs.service.RepositorySyncServiceImpl] Fetching all remote repositories for organization [orgName] took 100s
2023-07-04 22:05:03,172-0700 Caesium-1-3 ERROR ServiceRunner     [c.a.j.p.dvcs.service.RepositorySyncServiceImpl] Failed to synchronize list of repositories for organization [orgName]
java.lang.NullPointerException
	at com.atlassian.jira.plugins.dvcs.spi.github.GithubCommunicator.convertToLocalRepositories(GithubCommunicator.java:269) 

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available