table management fixes

app/assets/javascripts/supplier/qsupplier.js.coffee

@@ -134,10 +134,8 @@ root.Qsupplier=
       Qsupplier.build_list_table(body, foot, res)
     )
   build_list_table: (body, foot, res) ->
-    if !res.orders && !res.orders.length
-      alert('No orders in list')
-      return
     body.html('')
+    return unless res.orders
     for order in res.orders
       body.append @mustache('#list-order-template', new Order(order))
     foot.find('.list-total').html(currency(res.total_amount))
@@ -160,10 +158,11 @@ root.Qsupplier=
     by_row_count = parseInt($('#arrange-tables-by-row-count').val())
     by_column_count = parseInt($('#arrange-tables-by-column-count').val())
     if(option == "by_row")
-      return alert('Please fill in a positive number representing the number of tables per row') unless by_row_count && by_row_count > 0
+      return @alert(t('section.arrange_tables.by_row_no_row_count')) unless by_row_count && by_row_count > 0
     if(option == "by_column")
-      return alert('Please fill in a positive number representing the number of tables per column') unless by_column_count && by_column_count > 0
-    $.post('/supplier/sections/'+current_section_id+'/arrange_tables', {option: option, row_count: by_row_count, column_count: by_column_count}, -> window.location.reload())
+      return @alert(t('section.arrange_tables.by_column_no_column_count')) unless by_column_count && by_column_count > 0
+    $.post '/supplier/sections/'+current_section_id+'/arrange_tables', {option: option, row_count: by_row_count, column_count: by_column_count}, (response)=>
+      if response.ok then window.location.reload() else @alert(t(response.message))
     false
   mustache: (selector, locals)->
     locs = $.extend(locals,
@@ -172,3 +171,4 @@ root.Qsupplier=
           currency(Mustache.render(val, this))
     )
     Mustache.to_html($(selector).html(), locs)
+  alert: Qwaiter.alert