Add explicit check for name not None

[maneesh29s]

• Tests added / passed
• Passes pre-commit run --all-files

With #9120 , I had added dask worker's name as a prefix into the default executor.

The LocalCluster by default names the workers as numbers, starting from 0.
Assuming the LocalCluster spawns 3 workers, 1 thread each, the names of the dask workers are allocated like this:

Dask-Default-Threads-2770614-0
1-Dask-Default-Threads-2770626-0
2-Dask-Default-Threads-2770614-0

The prefix 0- is missing from the first worker's name.

This PR fixes this, explictly checking for name is not None.

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

    31 files  ±0      31 suites  ±0   11h 10m 2s ⏱️ - 7m 26s
 4 121 tests ±0   4 013 ✅  - 1    105 💤 ±0  3 ❌ +1 
59 815 runs  ±0  57 324 ✅  - 1  2 488 💤 ±0  3 ❌ +1 

For more details on these failures, see this check.

Results for commit ead8f87. ± Comparison against base commit cf508b9.

[crusaderky]

Thank you!