Bug Description

fetchUserRepositories() in scrumHelper.js has empty catch blocks that silently swallow errors (lines 2285-2286):
Both outer and inner catch blocks are completely empty:

} catch (err) {}  // Line 2285 GraphQL fetch error
} catch (err) {}  // Line 2286 outer function error

When the GraphQL request fails or any network error occurs, the function returns undefined instead of []. Callers like performRepoFetch() in popup.js (line 1439) then set availableRepos = undefined, causing availableRepos.filter(...) to crash with a TypeError.

Steps to Reproduce

Steps to reproduce the behavior:

1. Disconnect network or use an invalid GitHub token
2. Enable repository filtering and trigger a repo fetch
3. Observe: no error message shown, repo filter UI crashes silently

Expected Behavior

• Errors should be logged to console with meaningful messages
• Function should return [] on failure so callers don't crash

Actual Behavior

• No error message shown, repo filter UI crashes silently

Screenshots

N/A

Additional Context

Add any other context about the problem here.

Contribution Checklist

• I have searched existing issues to ensure this bug hasn't been reported
• I have provided clear reproduction steps
• I have included relevant environment details
• I have described both expected and actual behavior