To/#380 null handling operation time

[t-ober]

Resolves #380

[codecov]

Codecov Report

Merging #383 (1724e02) into dev (00c3b3a) will increase coverage by 0.80%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev     #383      +/-   ##
============================================
+ Coverage     77.76%   78.56%   +0.80%     
- Complexity     1922     2047     +125     
============================================
  Files           241      254      +13     
  Lines          7830     8124     +294     
  Branches        747      767      +20     
============================================
+ Hits           6089     6383     +294     
- Misses         1321     1353      +32     
+ Partials        420      388      -32     

Impacted Files	Coverage Δ
.../java/edu/ie3/datamodel/utils/GridAndGeoUtils.java	66.66% <0.00%> (-24.25%)	⬇️
...atamodel/models/input/container/GridContainer.java	54.16% <0.00%> (-17.71%)	⬇️
...main/java/edu/ie3/datamodel/graph/SubGridGate.java	34.48% <0.00%> (-9.64%)	⬇️
...ls/timeseries/individual/IndividualTimeSeries.java	72.72% <0.00%> (-4.55%)	⬇️
...java/edu/ie3/datamodel/io/factory/FactoryData.java	47.22% <0.00%> (-4.40%)	⬇️
...3/datamodel/io/source/csv/CsvTimeSeriesSource.java	96.07% <0.00%> (-3.93%)	⬇️
...factory/result/SystemParticipantResultFactory.java	92.42% <0.00%> (-2.89%)	⬇️
...models/timeseries/repetitive/LoadProfileInput.java	40.90% <0.00%> (-2.57%)	⬇️
.../ie3/datamodel/io/source/sql/SqlWeatherSource.java	78.81% <0.00%> (-2.19%)	⬇️
...odel/io/source/influxdb/InfluxDbWeatherSource.java	87.77% <0.00%> (-0.73%)	⬇️
... and 92 more

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