Add log10 variant adding 1 to every input values in case any zeros are found
Remove useless log10 transformation variant that substituted only zeros instead of incrementing all the input values
Merge branch 'draw-iri' into draw-iri-fix-log10-zeros-management
Enable transform_attribute action only if a vector layer is selected. Otherwise keep it disabled.
Log10 transformation variants are: producing NULL for input zeros, or translating every input values by +1 in case any zeros are found
Add the new attribute containing the transformed values, only in case the transformation produces any meaningful output; otherwise only show an error message in the notification area
Merge pull request #45 from gem/draw-iri-fix-log10-zeros-management

Implement log10 variants allowing to 1) ignore input zeros (producing NULL outputs for those) or 2) translate all inputs by +1 in case any zeros are found