#67 do not use isnothing

Author: Ben Baumgold

src/TableView.jl

@@ -206,7 +206,7 @@ function _showtable_sync!(w, schema, names, types, rows, coldefs, tablelength, i
         gridOptions.components = Dict(
             "rowNumberRenderer" => RowNumberRenderer
         )
-        if $(!isnothing(license))
+        if $(license !== nothing)
             agGrid.LicenseManager.setLicenseKey($license)
         end
         this.table = @new agGrid.Grid(el, gridOptions)
@@ -249,7 +249,7 @@ function _showtable_async!(w, schema, names, types, rows, coldefs, tablelength,
         gridOptions.components = Dict(
             "rowNumberRenderer" => RowNumberRenderer
         )
-        if $(!isnothing(license))
+        if $(license !== nothing)
             agGrid.LicenseManager.setLicenseKey($license)
         end
         this.table = @new agGrid.Grid(el, gridOptions)