Fix views involving BlockIndex{N}

[mtfishman]

Fixes #442.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.90%. Comparing base (e9c28d4) to head (700b783).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #478       +/-   ##
===========================================
+ Coverage    0.00%   93.90%   +93.90%     
===========================================
  Files          19       19               
  Lines        1689     1705       +16     
===========================================
+ Hits            0     1601     +1601     
+ Misses       1689      104     -1585     

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