diagcfg: Allow diagcfg to create logging.config in data directory.

[winder]

Summary

When running diagcfg as a user without a home directory, the missing global default directory prevents diagcfg from writing logging.config. With this change, the error is cleared out so that the file can be created as usual.

The only risk is if the global logging file was being used, and is for some reason temporarily inaccessible, those defaults would not be copied into the new file.

Test Plan

Manual testing.

Run diagcfg with ALGORAND_DATA and -d, the file is created in the data directory.
Run diagcfg without ALGORAND_DATA or -d, the file is created in the default global directory.

Also tested on a docker environment where the user did not have a home directory (or default global directory), the logging file is created in the data directory.

[codecov-commenter]

Codecov Report

Merging #3912 (9bd7afa) into master (452af1c) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #3912      +/-   ##
==========================================
+ Coverage   50.06%   50.07%   +0.01%     
==========================================
  Files         394      394              
  Lines       68471    68471              
==========================================
+ Hits        34279    34287       +8     
+ Misses      30491    30484       -7     
+ Partials     3701     3700       -1     

Impacted Files	Coverage Δ
logging/telemetry.go	81.66% <50.00%> (ø)
data/transactions/verify/txn.go	44.15% <0.00%> (-0.87%)	⬇️
cmd/tealdbg/debugger.go	72.69% <0.00%> (-0.81%)	⬇️
ledger/acctupdates.go	68.51% <0.00%> (-0.27%)	⬇️
catchup/service.go	68.88% <0.00%> (ø)
network/wsPeer.go	68.61% <0.00%> (+0.55%)	⬆️
data/abi/abi_type.go	88.62% <0.00%> (+0.94%)	⬆️
catchup/peerSelector.go	100.00% <0.00%> (+1.04%)	⬆️
ledger/tracker.go	76.82% <0.00%> (+2.14%)	⬆️
ledger/roundlru.go	96.22% <0.00%> (+5.66%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 452af1c...9bd7afa. Read the comment docs.