Summary

For the Spectrum Viewer, if NaNs exist in the data, there are gaps in the Spectrum Plot but no obvious explanation as to why. There needs to be a form of warning to the user that there are NaNs in the current slice or in the data stack itself, as there is for the main window and the Operations window.

Steps To Reproduce

1. Load Spectrum Viewer with data which has NaNs, e.g. the Fe dataset

Expected Behaviour

Show a warning if there is a NaN in the current slice or give a list of slice indices with NaNs. If possible, when the warning Icon is hovered over, highlight the position of the NaNs in the slice.

Current Behaviour

No NaN detection and non complete plot of the Spectrum .