Improve error handling for client when updating provider list

[ml-evs]

Timeouts/errors were previously not being caught when querying index meta-databases.

[codecov]

Codecov Report

Merging #1222 (04cbe8f) into master (1a0fdc3) will decrease coverage by 0.05%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##           master    #1222      +/-   ##
==========================================
- Coverage   91.29%   91.23%   -0.06%     
==========================================
  Files          72       72              
  Lines        4294     4299       +5     
==========================================
+ Hits         3920     3922       +2     
- Misses        374      377       +3     

Flag	Coverage Δ
project	91.23% <28.57%> (-0.06%)	⬇️
validator	90.62% <28.57%> (-0.06%)	⬇️

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Impacted Files	Coverage Δ
optimade/utils.py	61.76% <28.57%> (-1.73%)	⬇️

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[ml-evs]

Would you mind taking a look at this @JPBergsma?

[JPBergsma]

Sorry for the late response.
I have just been on holiday and there is a whole flood of messages from the last OPTIMADE meeting that I still have to get through.
The changes look good to me.

[ml-evs]

Sorry for the late response. I have just been on holiday and there is a whole flood of messages from the last OPTIMADE meeting that I still have to get through. The changes look good to me.

No problem @JPBergsma, hope you had a good holiday! I am very much still catching up too 😅 No need to rush through the other PRs.