fix trying to import OpenTopography

[peterdudfield]

Pull Request

Description

optionl for not import openTopography

Helps with openclimatefix/india-forecast-app#12

How Has This Been Tested?

CI 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]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 76.33%. Comparing base (64ed0e0) to head (8d25def).

Files	Patch %	Lines
ocf_datapipes/training/common.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
- Coverage   76.36%   76.33%   -0.04%     
==========================================
  Files         122      122              
  Lines        5755     5760       +5     
==========================================
+ Hits         4395     4397       +2     
- Misses       1360     1363       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.