OpenAPI generation fails with a Map[String, List[String]]

[countfloyd]

For a field of type Map[String, List[String]] (or List of anything for that matter), the OpenAPI generator fails

Run this program to reproduce:

import zio.http.endpoint.openapi.JsonSchema
import zio.http.endpoint.openapi.JsonSchema.SchemaStyle
import zio.schema.*

import scala.collection.immutable.List

@main def schema(): Unit =
  val schema = Schema.map[String, List[String]]
  val s = JsonSchema.fromZSchemaMulti(schema, SchemaStyle.Reference)
  println(s.toString)

The OpenAPI generation should succeed. Instead, get this exception:

Exception in thread "main" java.util.NoSuchElementException: None.get
	at scala.None$.get(Option.scala:627)
	at scala.None$.get(Option.scala:626)
	at zio.http.endpoint.openapi.JsonSchema$.fromZSchemaMulti(JsonSchema.scala:378)
	at com.g1.esg1.v10n.web.schema$package$.schema(schema.scala:25)
	at com.g1.esg1.v10n.web.schema.main(schema.scala:23)

• OS: macOS 14.5
• Version Java 22

Using zio-http 3.0.0-RC8 and Scala 3.4.2

[jdegoes]

/bounty $75 for test case and fix.

[algora-pbc]

## 💎 $75 bounty • ZIO

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1. Start working: Comment /attempt #2916 with your implementation plan
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Attempt	Started (GMT+0)	Solution
🟢 @pawelsadlo	Aug 1, 2024, 9:07:26 PM	#2996

[pawelsadlo]

/attempt #2916

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