Tests for views with no indices

[jishnub]

This adds tests to ensure that operations such as

julia> B = BlockArray(zeros(6,6), 1:3, 1:3);

julia> view(B)
ERROR: BoundsError: attempt to access 3×3-blocked 6×6 BlockMatrix{Float64, Matrix{Matrix{Float64}}, Tuple{BlockedUnitRange{ArrayLayouts.RangeCumsum{Int64, UnitRange{Int64}}}, BlockedUnitRange{ArrayLayouts.RangeCumsum{Int64, UnitRange{Int64}}}}} at index []

throw a BoundsError. This should prevent regressions.

[codecov]

Codecov Report

Merging #297 (3bdaf1e) into master (7b83868) will decrease coverage by 4.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #297      +/-   ##
==========================================
- Coverage   92.29%   87.96%   -4.33%     
==========================================
  Files          16       16              
  Lines        1479     1479              
==========================================
- Hits         1365     1301      -64     
- Misses        114      178      +64     

see 13 files with indirect coverage changes

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