ResidualAnalysisView hides double columns containing NaN

[mkommend]

This is not the case for string or DateTime columns. The reason therefore is that the check for at least two distinct values is implemented by calculating the difference between the minimum and maximum value. However, comparisons with NaN always results in false; thus the minimum and the maximum is NaN and the column is hidden.

This can be easily corrected by applying the same check as it is done for DateTime and string columns.

[mkommend]

r15891: Fixed hiding of double columns in ResidualAnalysisView.

[gkronber]

Reviewed r15891.

[mkommend]

r15996: Merged r15891 into stable.