Updating validation so that node or python images can be selected

[jamiehewitt15]

Fixes #1998

Changes proposed in this PR:

• Updating the validation so that the custom input checks only happen if custom image has been selected.

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Name	Status	Preview	Updated (UTC)
market	✅ Ready (Inspect)	Visit Preview	Nov 14, 2023 8:42am

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| Name | Status | Preview | Updated (UTC) | | :--- | :----- | :------ | :------ | | **dubai-challenge** | ⬜️ Ignored ([Inspect](https://vercel.com/oceanprotocol/dubai-challenge/68zDo4ziC9TwrxWsDX8jbcuuy6GU)) | | Nov 14, 2023 8:42am |

[codeclimate[bot]]

Code Climate has analyzed commit 33fe7c4a and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 20.2%.

View more on Code Climate.