Add default '' on hosted checkout page if no desription is given

Description

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      1. Description
        On client hosted checkout page, if no description is provided for the product, `None` is displayed. This PR is to provide a default `''` in that case

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      1. Screenshot

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          ![image](https://user-images.githubusercontent.com/42166091/79110183-4cc70f80-7d93-11ea-80f5-7e7385ff82d0.png)

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        1. After
          ![image](https://user-images.githubusercontent.com/42166091/79110201-5b152b80-7d93-11ea-908f-635dd482894d.png)

Assignee

Unassigned

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Danial Malik

Repo

edx/ecommerce

Customer

None

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

None

Platform Map Area (Levels 3 & 4)

None

Blended Hour Utilization Percentage

None

Priority

Unset
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