fix: empty arrays should convert to empty string in LLM prompts (#23590)

api/core/variables/segments.py

 
 
 class ArraySegment(Segment):
+    @property
+    def text(self) -> str:
+        # Return empty string for empty arrays instead of "[]"
+        if not self.value:
+            return ""
+        return super().text
+
     @property
     def markdown(self) -> str:
         items = []
 
     @property
     def text(self) -> str:
+        # Return empty string for empty arrays instead of "[]"
+        if not self.value:
+            return ""
         return json.dumps(self.value, ensure_ascii=False)