Handle some more API errors

src/lib/Chat.svelte

@@ -11,9 +11,7 @@
     getMessage,
     currentChatMessages,
     setCurrentChat,
-
     currentChatId
-
   } from './Storage.svelte'
   import {
     type Message,

src/lib/ChatCompletionResponse.svelte

@@ -90,7 +90,10 @@ export class ChatCompletionResponse {
 
   updateFromSyncResponse (response: Response) {
     this.setModel(response.model)
-    response.choices.forEach((choice, i) => {
+    if (!response.choices) {
+      return this.updateFromError(response?.error?.message || 'unexpected response from API')
+    }
+    response.choices?.forEach((choice, i) => {
       const exitingMessage = this.messages[i]
       const message = exitingMessage || choice.message
       if (exitingMessage) {
@@ -121,7 +124,10 @@ export class ChatCompletionResponse {
   updateFromAsyncResponse (response: Response) {
     let completionTokenCount = 0
     this.setModel(response.model)
-    response.choices.forEach((choice, i) => {
+    if (!response.choices) {
+      return this.updateFromError(response?.error?.message || 'unexpected streaming response from API')
+    }
+    response.choices?.forEach((choice, i) => {
       const message = this.messages[i] || {
         role: 'assistant',
         content: '',

src/lib/ChatRequest.svelte

@@ -451,7 +451,7 @@ export class ChatRequest {
                 ...overrides
               } as ChatSettings)
               // Wait for the response to complete
-              if (!summary.hasFinished()) await summary.promiseToFinish()
+              if (!summary.hasError() && !summary.hasFinished()) await summary.promiseToFinish()
               if (summary.hasError()) {
                 // Failed for some API issue. let the original caller handle it.
                 _this.updating = false