Update utils.py

front/utils.py

@@ -43,6 +43,8 @@ def process_figures(docs:list)->tuple:
     gallery=[]
     used_figures =[]
     figures = '<div class="figures-container"><p></p> </div>'
+    if docs == []:
+        return figures, gallery
     docs_figures = [d for d in docs if d.metadata["chunk_type"] == "image"]
     for i, doc in enumerate(docs_figures):
         if doc.metadata["chunk_type"] == "image":