#3215: Curves: Exported csv file is imported back to DG incorrectly in some cases (if there is data for curves)

[katerina-stepanova]

v1.22.2, 1.22.3

Steps to reproduce:

1. Create/open some table
2. Add a column, so that its values have some json content with an empty value, e.g. data for drawing a curve like following(see "showPoints":""):
   {"series":[{"pointColor":"#CCCCCC","fitLineColor":"#CCCCCC","name":"50%","showPoints":"","lineStyle":"dashed","connectDots":false,"showFitLine":true,"points":[{"x":0,"y":50},{"x":8,"y":50}]},{"fitLineColor":"#8D1F1B","pointColor":"#8D1F1B","points":[{"x":0,"y":100},{"x":4,"y":98.4},{"x":8,"y":89.6}]}]}

3. Export table as csv
4. Import exported file into DG

See example exported file:
broken_import.csv

Expected results: imported table should look exactly the same as the table that was exported.
Actual results: value for the cell with json value is cropped, next columns are empty. In some cases further rows might be also parsed incorrectly (especially if there are some molecules in MOL format)

[dnillovna]

This issue has been mirrored in Jira: https://reddata.atlassian.net/browse/GROK-17312