Fix get_time_series when passing AbstractDeterministic

[codecov[bot]]

Codecov Report

Merging #202 (4345461) into master (df92029) will decrease coverage by 2.83%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
- Coverage   74.55%   71.71%   -2.84%     
==========================================
  Files          42       42              
  Lines        3018     2698     -320     
==========================================
- Hits         2250     1935     -315     
+ Misses        768      763       -5     

Flag	Coverage Δ
unittests	71.71% <100.00%> (-2.84%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/validation.jl	9.90% <ø> (-1.42%)	:arrow_down:
src/hdf5_time_series_storage.jl	94.01% <100.00%> (-0.30%)	:arrow_down:
src/utils/assert_op.jl	44.44% <0.00%> (-13.89%)	:arrow_down:
src/utils/test.jl	42.30% <0.00%> (-7.70%)	:arrow_down:
src/single_time_series.jl	59.74% <0.00%> (-7.29%)	:arrow_down:
src/time_series_container.jl	53.65% <0.00%> (-6.76%)	:arrow_down:
src/serialization.jl	44.44% <0.00%> (-6.06%)	:arrow_down:
src/internal.jl	70.73% <0.00%> (-5.87%)	:arrow_down:
src/deterministic_metadata.jl	5.00% <0.00%> (-4.53%)	:arrow_down:
src/utils/utils.jl	55.45% <0.00%> (-4.13%)	:arrow_down:
... and 28 more