Handle out-of-bounds blockcolstop/blockrowstop

[jishnub]

The following works after this:

julia> using BlockBandedMatrices, LinearAlgebra

julia> B = BlockSkylineMatrix{Bool}(I, 1:1, 1:5, ([0,0,0,0,0],[0,1,1,1,1]))
1×5-blocked 1×15 BlockSkylineMatrix{Bool, Vector{Bool}, BlockBandedMatrices.BlockSkylineSizes{Tuple{BlockArrays.BlockedUnitRange{ArrayLayouts.RangeCumsum{Int64, UnitRange{Int64}}}, BlockArrays.BlockedUnitRange{ArrayLayouts.RangeCumsum{Int64, UnitRange{Int64}}}}, Vector{Int64}, Vector{Int64}, BandedMatrices.BandedMatrix{Int64, Matrix{Int64}, Base.OneTo{Int64}}, Vector{Int64}}}:
 1  │  0  0  │  ⋅  ⋅  ⋅  │  ⋅  ⋅  ⋅  ⋅  │  ⋅  ⋅  ⋅  ⋅  ⋅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.22%. Comparing base (7df446b) to head (36d3b81).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
- Coverage   88.37%   88.22%   -0.15%     
==========================================
  Files          11       11              
  Lines        1204     1206       +2     
==========================================
  Hits         1064     1064              
- Misses        140      142       +2     

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