add test if there is no data

[peterdudfield]

Pull Request

Description

add default for updating input lastest data

How Has This Been Tested?

added a test + normal tests

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #25 (c8a593a) into main (9ad5bb2) will increase coverage by 0.01%. The diff coverage is 100.00%.

:exclamation: Current head c8a593a differs from pull request most recent head 630fb49. Consider uploading reports for the commit 630fb49 to get more accurate results

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   97.41%   97.43%   +0.01%     
==========================================
  Files          16       16              
  Lines         542      546       +4     
==========================================
+ Hits          528      532       +4     
  Misses         14       14              

Impacted Files	Coverage Δ
nowcasting_datamodel/read/read.py	99.01% <100.00%> (+0.04%)	:arrow_up:

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