fix #327 DataType has no field ninitialized

[jw3126]

fix #327

[codecov]

Codecov Report

Merging #331 (10874f1) into master (6db2287) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
+ Coverage   89.87%   89.88%   +0.01%     
==========================================
  Files          27       27              
  Lines        2715     2720       +5     
==========================================
+ Hits         2440     2445       +5     
  Misses        275      275              

Impacted Files	Coverage Δ
src/backwards_compatibility.jl	75.00% <100.00%> (+8.33%)	⬆️
src/data/reconstructing_datatypes.jl	74.00% <100.00%> (ø)
src/data/writing_datatypes.jl	96.58% <100.00%> (ø)
src/dataio.jl	98.46% <0.00%> (+0.01%)	⬆️

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[JonasIsensee]

Hi @jw3126 ,
thanks a lot for taking care of this!

[jw3126]

@JonasIsensee thanks a lot for maintaining this essential package!