empty arrays should not be treated as NULL values

[denizzzka]

No description provided.

[codecov-io]

Codecov Report

Merging #116 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
+ Coverage   92.19%   92.24%   +0.05%     
==========================================
  Files          19       19              
  Lines        1640     1651      +11     
==========================================
+ Hits         1512     1523      +11     
  Misses        128      128

Impacted Files	Coverage Δ
src/dpq2/conv/native_tests.d	100% <100%> (ø)	⬆️
src/dpq2/conv/arrays.d	100% <100%> (ø)	⬆️

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[coveralls]

Coverage increased (+0.05%) to 92.247% when pulling 7fc06a3 on empty_arrays into ae064f2 on master.