Fixed a regression in column type labeling

[Mailaender]

Closes #803

[eselmeister]

I was not able to reproduce the error so far. The error message is thrown in the calculateIndices(...) method of the class:
org.eclipse.chemclipse.chromatogram.xxd.calculator.supplier.amdiscalri.impl.RetentionIndexCalculator

IMHO, I doubt that the runnable is involved here. It seems to be, that the RI entries can't be fetched:

ISeparationColumnIndices separationColumnIndices = getSeparationColumnIndices(chromatogramSelection, calculatorSettings);
if(separationColumnIndices != null) {
	...
} else {
	processingInfo.addErrorMessage(DESCRIPTION, "The retention index map could not be found. Is a calibration (*.cal) file or chromatogram RI map available?");
}

We could try to delete the user preference and start the process again.

[Mailaender]

Hmm, yes this only seems to swallow the exception, no RIs are calculated and it still shows errors. See #803 (comment)

[Mailaender]

Okay, I can now confirm that this calculates retention indices again.

[eselmeister]

Is it on purpose that SEMI-POLAR is flipped in SeparationColumnType?

DEFAULT("Default", "DEFAULT"), //
POLAR("Polar", "POLAR"), //
APOLAR("Nonpolar", "APOLAR"), //
SEMI_POLAR("SEMI-POLAR", "Semipolar"),

[Mailaender]

No, I was hasty there. Fixed.