Island: Ignore exception in delete_file() if file not found

monkey/monkey_island/cc/services/directory_file_storage_service.py

@@ -40,7 +40,10 @@ class DirectoryFileStorageService(IFileStorageService):
     def delete_file(self, unsafe_file_name: str):
         safe_file_path = self._get_safe_file_path(unsafe_file_name)
 
-        safe_file_path.unlink()
+        try:
+            safe_file_path.unlink()
+        except FileNotFoundError:
+            pass
 
     def _get_safe_file_path(self, unsafe_file_name: str):
         # Remove any path information from the file name.

monkey/tests/unit_tests/monkey_island/cc/services/test_directory_file_storage_service.py

@@ -119,3 +119,10 @@ def test_remove_all_files__skip_directories(tmp_path):
 
     for file in tmp_path.iterdir():
         assert file.name == test_dir.name
+
+
+def test_remove_nonexistant_file(tmp_path):
+    fss = DirectoryFileStorageService(tmp_path)
+
+    # This test will fail if this call raises an exception.
+    fss.delete_file("nonexistant_file.txt")