Allow disabled eager loading with EAGER_IMPORT=0

[stefanv]

In the skimage CI, we had EAGER_IMPORT=0 mean lazy loading. Woops :)

[effigies]

As proposed, this turns an absent or empty variable into True, inverting the existing logic.

One possible fix.

[stefanv]

As proposed, this turns an absent or empty variable into True, inverting the existing logic.

Oh, yes, you're right; that would not have helped :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ccddd44) to head (4aead86).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #166   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          108       109    +1     
  Branches        19        19           
=========================================
+ Hits           108       109    +1     

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[stefanv]

@effigies Are you happy with the current version? I'd like to make a release for scikit-image's use.

[effigies]

Yup, thanks for the ping.