Display no matching region product with grey color in product selection

[pindge]

Fixes #57

Scope:

• add a test case for checking the product selection menu while on the region page, only products containing the same region will display in white and every other product display in grey (indicating empty)
• add product ls7_nbart_tmad_annual and one dataset sharing the same region_code as a dataset in ls5_nbart_tmad_annual
• if on region pages, product selection will grey out all products without matching region_code
• On any other page, only products with empty datasets will be greyed out.

[codecov]

Codecov Report

Merging #407 (8b08230) into develop (f20cdc9) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #407      +/-   ##
===========================================
+ Coverage    86.72%   86.76%   +0.04%     
===========================================
  Files           25       25              
  Lines         3148     3158      +10     
===========================================
+ Hits          2730     2740      +10     
  Misses         418      418              

Impacted Files	Coverage Δ
cubedash/_pages.py	88.25% <100.00%> (+0.04%)	⬆️
cubedash/summary/_extents.py	91.90% <100.00%> (+0.16%)	⬆️
cubedash/summary/_stores.py	92.07% <100.00%> (+0.04%)	⬆️

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[jeremyh]

Thanks Pin, nice idea!

[jeremyh]

Thanks Pin. We'll keep an eye on performance after deployment. If its too slow we should add an index.