plotObservedVsSimulated(): error when DataCombined only contains observed or simulated results

[PavelBal]

myCombDat <- DataCombined$new()

# load the simulation
sim <- loadTestSimulation("MinimalModel")
simResults <- importResultsFromCSV(
  simulation = sim,
  filePaths = getTestDataFilePath("Stevens_2012_placebo_indiv_results.csv")
)

myCombDat$addSimulationResults(
  simResults,
  quantitiesOrPaths = c(
    "Organism|Lumen|Stomach|Dapagliflozin|Gastric retention",
    "Organism|Lumen|Stomach|Dapagliflozin|Gastric emptying",
    "Organism|Lumen|Stomach|Metformin|Gastric retention"
  )
)

Following datasets were specified to be grouped but not found:
Organism|Lumen|Stomach|Dapagliflozin|Gastric emptying
Organism|Lumen|Stomach|Dapagliflozin|Gastric retention
Organism|Lumen|Stomach|Metformin|Gastric retention

Error in `dplyr::arrange()` at OSPSuite-R/R/utilities-units.R:585:2:
! Problem with the implicit `transmute()` step.
✖ Problem while computing `..1 = .rowidInternal`.
Caused by error:
! object '.rowidInternal' not found
Run `rlang::last_error()` to see where the error occurred.
Warning messages:
1: Unknown or uninitialised column: `yUnitSplit`. 
2: Unknown or uninitialised column: `molWeightSplit`. 

Instead, it should produce an empty plot (and, if defined in the plot configuration, title subtitle and so on).

[PavelBal]

Same for observed only

[IndrajeetPatil]

In both cases, the function will return a NULL with an informative warning about what went wrong.

library(ospsuite)

dataSet1 <- DataSet$new(name = "Dataset1")
dataSet1$setValues(1, 1)
dataSet1$yDimension <- ospDimensions$`Concentration (molar)`
dataSet1$molWeight <- 1

myCombDat <- DataCombined$new()
plotObservedVsSimulated(myCombDat)
#> Warning in plotObservedVsSimulated(myCombDat): No plot can be created because
#> the entered `DataCombined` object does not contain any datasets.
#> NULL

myCombDat$addDataSets(dataSet1)
plotObservedVsSimulated(myCombDat)
#> Following datasets were specified to be grouped but not found:
#> Dataset1
#> 
#> Warning in plotObservedVsSimulated(myCombDat): No plot can be created because
#> the entered `DataCombined` object does not contain any observed-simulated
#> datasets that can be paired.
#> NULL

^{Created on 2022-07-04 by the reprex package (v2.0.1.9000)}