Fix some exceptions

Author: timxx

qgitc/diffview.py

@@ -651,7 +651,7 @@ def __commitToTextLines(self, commit: Commit):
             if self._delayCommit:
                 return
 
-            for child in commit.children:
+            for child in commit.children or []:
                 content = self.tr("Child: ") + child.sha1
                 content += self.__commitDesc(child, child.repoDir)
                 self.viewer.addSHA1Line(content, False)

qgitc/llm.py

@@ -286,9 +286,9 @@ def handleNonStreamResponse(self, response: bytes):
         aiResponse = AiResponse()
         aiResponse.total_tokens = usage.get("total_tokens", 0)
 
-        for choice in data["choices"]:
-            message: dict = choice["message"]
-            content = message["content"]
+        for choice in data.get("choices", []):
+            message: dict = choice.get("message", {})
+            content = message.get("content", "")
             role = message.get("role", "assistant")
             aiResponse.role = AiRole.Assistant
             aiResponse.message = content