Fix ObjectList not deserializing items: null

[suryapandian]

Motivation

Metadata watcher gets deserialization error when trying to deserialize null. This PR tries to return default value during such cases.

Solution

if there is a way to extract the func out to be a common place, would be happy to do that.

[codecov]

Codecov Report

Merging #1199 (7b04a84) into main (d294847) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1199      +/-   ##
==========================================
- Coverage   73.51%   73.50%   -0.01%     
==========================================
  Files          68       68              
  Lines        5357     5360       +3     
==========================================
+ Hits         3938     3940       +2     
- Misses       1419     1420       +1     

Impacted Files	Coverage Δ
kube-core/src/object.rs	80.95% <100.00%> (+0.95%)	⬆️

... and 1 file with indirect coverage changes

[clux]

Looks good to me, thank you!

Context; we saw the items: null cause an error in metadata_watcher for this during the initial list_metadata call when the return set was empty.