Issue/bug gap blend

[peterdudfield]

Pull Request

Description

• add test for bug in gap of data
• refactor, change to a loop that is more readable, and easily to adapt in the future
• add extra feature to look at future weights if there is a gap in the forecast

Fixes #222

How Has This Been Tested?

• CI tests

• added a test to cover behaviour

• check with API

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [x] 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[bot]]

Codecov Report

Merging #223 (ff3bf2a) into main (983d16e) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
+ Coverage   95.05%   95.16%   +0.11%     
==========================================
  Files          27       27              
  Lines        1697     1717      +20     
==========================================
+ Hits         1613     1634      +21     
+ Misses         84       83       -1     

Impacted Files	Coverage Δ
nowcasting_datamodel/read/blend/blend.py	98.14% <ø> (+1.85%)	:arrow_up:
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/read/blend/utils.py	93.13% <100.00%> (+1.67%)	:arrow_up:

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