Fix OpenAI API error handling when generating commit message.

aicommits.ts

@@ -55,8 +55,8 @@ export async function main() {
   console.log(
     chalk.white("▲ ") + chalk.gray("Generating your AI commit message...\n")
   );
+  try {
     const aiCommitMessage = await generateCommitMessage(prompt);
-
     console.log(
       chalk.white("▲ ") + chalk.bold("Commit message: ") + aiCommitMessage + "\n"
     );
@@ -79,6 +79,11 @@ export async function main() {
       stdio: "inherit",
       encoding: "utf8",
     });
+
+  } catch(e) {
+    console.error(chalk.white("▲ ") + chalk.red(e.message));
+    process.exit(1);
+  }
 }
 
 async function generateCommitMessage(prompt: string) {
@@ -101,6 +106,10 @@ async function generateCommitMessage(prompt: string) {
     method: "POST",
     body: JSON.stringify(payload),
   });
+  if(response.status !== 200) {
+    const errorJson: any = await response.json();  
+    throw new Error(`OpenAI API failed while processing the request '${errorJson?.error?.message}'`);
+  }
 
   const json: any = await response.json();
   const aiCommit = json.choices[0].text;