[fix] handle error of `integrate`

[hsloot]

Related issues

Closes #90

Checklist

• [x] R CMD CHECK successful
• [x] tests included
• [x] documentation included or updated
• [x] commit messages follow commit guidelines

Only for new or refactored algorithms:

• [x] benchmarks (and comparison with the previous version) included

Optional, but recommended:

• [x] code passes lintr::lint_package() without errors

Description

• Explicitly handle integration error with possible adjustment for very small values.

[codecov[bot]]

Codecov Report

Merging #94 (aea5593) into master (429b224) will decrease coverage by 0.66%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
- Coverage   92.52%   91.85%   -0.67%     
==========================================
  Files          32       32              
  Lines        1337     1351      +14     
==========================================
+ Hits         1237     1241       +4     
- Misses        100      110      +10     

Impacted Files	Coverage Δ
R/valueOf-S4.R	93.20% <50.00%> (-6.12%)	:arrow_down:

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