refactor: tts node add warning

Author: wxg0103

apps/common/util/common.py

@@ -214,6 +214,8 @@ def split_and_transcribe(file_path, model, max_segment_length_ms=59000, audio_fo
 
 
 def _remove_empty_lines(text):
+    if not isinstance(text, str):
+        raise AppApiException(500, '文本转语音节点，文本内容必须是字符串类型')
     if not text:
         raise AppApiException(500, '文本转语音节点，文本内容不能为空')
     result = '\n'.join(line for line in text.split('\n') if line.strip())
@@ -248,4 +250,3 @@ def markdown_to_plain_text(md: str) -> str:
     # 去除首尾空格
     text = text.strip()
     return text
-