lk | receipt button appears when client has a bike

app/views/clients/_receipt_button.html.haml

@@ -0,0 +1,2 @@
+.btn.btn-default
+  = link_to 'Print Receipt', client_receipt_path(@client)

app/views/clients/edit.html.haml

@@ -1,4 +1,5 @@
 .container
   %h1 Edit client
+  = render 'receipt_button' if @client.bike_id
   = render 'form'
   = link_to 'Back', clients_path

app/views/freecyclery/receipt.html.haml

@@ -10,7 +10,7 @@
         .client-information
         = @client.name
         %br
-        = @client.agency.agency_name
+        = @client.agency.agency_name if @client.agency
         .horizontal-line
         %br
         = 'Paid $25 for lock and helmet' if @client.will_pay
@@ -47,7 +47,7 @@
         .client-information
         = @client.name
         %br
-        = @client.agency.agency_name
+        = @client.agency.agency_name if @client.agency
         .horizontal-line
         %br
         = 'Paid $25 for lock and helmet' if @client.will_pay