Test empty sale and purchase with a comment line

The states of the button prevents to quote without any line.

modules/commission/tests/scenario_agent_selection.rst

@@ -64,6 +64,7 @@ Create sale::
     >>> Sale = Model.get('sale.sale')
     >>> sale = Sale()
     >>> sale.party = customer
+    >>> line = sale.lines.new(type='comment')
     >>> sale.save()
 
 The agent is assigned on quotation::
@@ -80,6 +81,7 @@ Agent is not set for yesterday sales::
     >>> sale = Sale()
     >>> sale.sale_date = yesterday
     >>> sale.party = customer
+    >>> line = sale.lines.new(type='comment')
     >>> sale.click('quote')
     >>> sale.state
     'quotation'
@@ -99,6 +101,7 @@ Creating a sale and test agent is assigned::
     >>> sale = Sale()
     >>> sale.party = other_customer
     >>> sale.agent
+    >>> line = sale.lines.new(type='comment')
     >>> sale.click('quote')
     >>> sale.state
     'quotation'

modules/purchase/tests/scenario_purchase_empty.rst

@@ -24,6 +24,7 @@ Create empty purchase::
     >>> Purchase = Model.get('purchase.purchase')
     >>> purchase = Purchase()
     >>> purchase.party = supplier
+    >>> line = purchase.lines.new(type='comment')
     >>> purchase.click('quote')
     >>> purchase.state
     'quotation'

modules/purchase_history/tests/scenario_purchase_history.rst

@@ -23,6 +23,7 @@ Create a purchase::
    >>> Purchase = Model.get('purchase.purchase')
    >>> purchase = Purchase()
    >>> purchase.party = supplier
+   >>> line = purchase.lines.new(type='comment')
    >>> purchase.click('quote')
 
    >>> purchase.number

modules/sale/tests/scenario_sale_empty.rst

@@ -24,6 +24,7 @@ Create empty sale::
     >>> Sale = Model.get('sale.sale')
     >>> sale = Sale()
     >>> sale.party = customer
+    >>> line = sale.lines.new(type='comment')
     >>> sale.click('quote')
     >>> sale.state
     'quotation'

modules/sale/tests/scenario_sale_quotation.rst

@@ -36,6 +36,7 @@ Create customer::
 Create a quotation::
 
     >>> sale = Sale(party=customer)
+    >>> line = sale.lines.new(type='comment')
     >>> sale.click('quote')
     >>> sale.state
     'quotation'

modules/sale_history/tests/scenario_sale_history.rst

@@ -23,6 +23,7 @@ Create a sale::
    >>> Sale = Model.get('sale.sale')
    >>> sale = Sale()
    >>> sale.party = customer
+   >>> line = sale.lines.new(type='comment')
    >>> sale.click('quote')
 
    >>> sale.number