fix time filtering for NWP dropout

[dfulu]

Pull Request

Description

The time filtering used previously was not properly taking into account the NWP dropout and the fact that it might select a previous timestamp as if the most recent NWP was not available. This caused some edge cases where the pipeline would fail.

This fixes the issue

Checklist:

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

[codecov[bot]]

Codecov Report

Merging #217 (690c62f) into main (ba5b318) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #217   +/-   ##
=======================================
  Coverage   81.44%   81.44%           
=======================================
  Files         128      128           
  Lines        5568     5563    -5     
=======================================
- Hits         4535     4531    -4     
+ Misses       1033     1032    -1     

Files Changed	Coverage Δ
ocf_datapipes/training/pvnet.py	82.22% <ø> (ø)
ocf_datapipes/training/common.py	95.54% <100.00%> (+0.47%)	:arrow_up:

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