import pdfplumber

def extract_text_from_pdf(file_path: str) -> str:
    if file_path is None:
        return ""
    try:
        with pdfplumber.open(file_path) as pdf:
            pages = [page.extract_text() or "" for page in pdf.pages]
        return "\n".join(pages).strip()
    except Exception as e:
        return f"Chyba při čtení PDF: {str(e)}"