From a3c645d10091f792a18dd9933f535c2ff3a5a84d Mon Sep 17 00:00:00 2001
From: Perun CaseStudies <Perun@case_studies.com>
Date: Mon, 11 Nov 2024 03:20:23 +0100
Subject: [PATCH] Deltadebugging fix type checker

---
 perun/deltadebugging/factory.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/perun/deltadebugging/factory.py b/perun/deltadebugging/factory.py
index 21c547f2..a107d566 100644
--- a/perun/deltadebugging/factory.py
+++ b/perun/deltadebugging/factory.py
@@ -110,10 +110,13 @@ def run_command_with_input(executable: Executable, complement: str, **kwargs: An
 
 def read_input(is_fuzzing: bool, **kwargs: Any) -> str:
     if is_fuzzing:
-        mutation: Mutation = kwargs.get("mutation")
+        mutation = kwargs.get("mutation")
+        if mutation is None:
+            raise ValueError("Got unexpected mutation")
         input_file = mutation.path
     else:
-        input_file = kwargs.get("input_sample")
+        input_file = kwargs.get("input_sample", "")
+
     input_path = Path(input_file)
     if input_path.is_file():
         with open(input_path, "r") as file: