Update ingestion.py

ingestion.py

@@ -4,7 +4,7 @@ import docx2txt
 def read_file(file):
     if file.name.endswith(".pdf"):
         reader = PdfReader(file)
-        return " ".join(p.extract_text() for p in reader.pages)
+        return " ".join(p.extract_text() or "" for p in reader.pages)
     if file.name.endswith(".docx"):
         return docx2txt.process(file)
     return file.read().decode("utf-8")