Fix issue in ingesting optional AOD variable for uvvis.doas.offaxis
Fix issue in ingesting optional AOD variable for uvvis.doas.offaxis

If 'AOD=measured' was set then the AEROSOL.OPTICAL.DEPTH.TROPOSPHERIC_SCATTER.SOLAR.OFFAXIS was never recognized as being available.

stcorp/harp,stcorp/harp,stcorp/harp,stcorp/harp,stcorp/harp,stcorp/harp