noosfero | Suppliers plugin: error when opening a product page (#247)

[Gabriel Silva]

New Issue was created.

Issue 247: https://gitlab.com/noosfero/noosfero/issues/247
Author:    Gabriel Silva
Assignee:  

When both suppliers and products plugins are enabled, it is not possible to open the show product page.

### Reproducing the bug

1. Enable `products` and `suppliers` plugins
2. Create a new product, or open an existing one (via the manage products/services button, from the control panel)
3. See the following error

```
Showing /home/vagrant/noosfero/config/plugins/products/views/products_plugin/page/show.html.erb where line #27 raised:

uninitialized constant SuppliersPlugin::SourceProduct::Product
```
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