area_um essential to load files

[maikherbig]

General information

• Operating System: Win7
• ShapeOut version: ShapeOut 0.9.3
• ShapeOut install: Windows 64bit installer

Steps to reproduce the problem

1. Open Shapeout
2. Search for a dataset that contains several features like area ratio, fluoresencence....
3. Select a dataset and press "Analyze"
4. Export to .rtdc but only export area ratio and for example fluorescence information
5. Import this file to ShapeOut

Expected behavior

ShapeOut lists the file in the measurement browser

Actual behavior

There is an error message: Feature 'area_um' does not exist