Fix column alignment on layer detail panel
Fix column alignment on layer detail panel

This fixes the column alignment on the layer detail panel by providing a
default value instead of an empty space.

Connects #326

raster-foundry/raster-foundry,aaronxsu/raster-foundry,kdeloach/raster-foundry,kdeloach/raster-foundry,kdeloach/raster-foundry,raster-foundry/raster-foundry,aaronxsu/raster-foundry,aaronxsu/raster-foundry,azavea/raster-foundry,kdeloach/raster-foundry,azavea/raster-foundry,raster-foundry/raster-foundry,azavea/raster-foundry,azavea/raster-foundry,kdeloach/raster-foundry,azavea/raster-foundry,aaronxsu/raster-foundry