[Bug]: Sub-Community Creation API Requests Don't Always Have Icons

[SuperMarioDaBom]

Checked Existing

• I have checked the repository for duplicate issues.

What happened?

After doing some experimentation with Super Smash Bros. for Wii U's online tournament mode, I found that a sub-community is created upon creating a custom tournament (akin to MK8's communities). As it is currently, the Juxt API returns a 400 error which is caused by missing icon data. Smash Bros. does not send icon data, but currently Juxt requires it as seen in the code snippet below.

miiverse-api/src/services/api/routes/communities.ts

Lines 23 to 28 in 28ef808

	const createNewCommunitySchema = z.object({
	name: z.string(),
	description: z.string().optional(),
	icon: z.string(),
	app_data: z.string().optional()
	});

What did you expect to happen?

A Juxt sub-community would be created.

Steps to reproduce?

Send a POST request to /v1/communities with no icon in the multipart data.

Other relevant information. (OPTIONAL)

It seems that instead of enforcing in the schema, it might be better to just have a generic icon to supply if no icon is provided.