fix deepseek provider path tests

Author: jahooma

web/src/app/api/v1/chat/completions/__tests__/completions.test.ts

@@ -779,6 +779,10 @@ describe('/api/v1/chat/completions POST endpoint', () => {
         const fetchedUrls: string[] = []
         const fetchViaDeepSeek = mock(
           async (url: string | URL | Request, init?: RequestInit) => {
+            if (String(url).startsWith('https://api.ipinfo.io/lookup/')) {
+              return Response.json({})
+            }
+
             fetchedUrls.push(String(url))
             fetchedBodies.push(JSON.parse(init?.body as string))
             return new Response(

web/src/llm-api/__tests__/deepseek-image-compat.integration.test.ts

@@ -50,6 +50,18 @@ describe('normalizeDeepSeekRequestBody', () => {
       model: 'deepseek-v4-pro',
     })
   })
+
+  it('does not throw on minimal provider-path bodies without messages', () => {
+    const body = {
+      model: 'deepseek/deepseek-v4-pro',
+      stream: false,
+    } as ChatCompletionRequestBody
+
+    expect(normalizeDeepSeekRequestBody(body)).toEqual({
+      ...body,
+      model: 'deepseek-v4-pro',
+    })
+  })
 })
 
 describe('buildDeepSeekRequestBody', () => {

web/src/llm-api/deepseek-request-body.ts

@@ -77,16 +77,20 @@ export function normalizeDeepSeekRequestBody(
   body: ChatCompletionRequestBody,
   originalModel: string = body.model,
 ): ChatCompletionRequestBody {
+  const messages = Array.isArray(body.messages)
+    ? body.messages.map((message) => ({
+        ...message,
+        content:
+          message.content === undefined || message.content === null
+            ? message.content
+            : contentPartsToDeepSeekText(message.content),
+      }))
+    : body.messages
+
   return {
     ...body,
     model: getDeepSeekModelId(originalModel),
-    messages: body.messages.map((message) => ({
-      ...message,
-      content:
-        message.content === undefined || message.content === null
-          ? message.content
-          : contentPartsToDeepSeekText(message.content),
-    })),
+    messages,
   }
 }