fix: calculate_md5 will return "" for nonexistent files

worthless/installer.py

@@ -492,7 +492,10 @@ class Installer:
         contents = await pkg_version.read_text()
 
         async def calculate_md5(file_to_calculate):
-            async with AsyncPath(file_to_calculate).open("rb") as f:
+            file_to_calculate = AsyncPath(file_to_calculate)
+            if not await file_to_calculate.exists():
+                return ""
+            async with file_to_calculate.open("rb") as f:
                 file_hash = hashlib.md5()
                 while chunk := await f.read(self._download_chunk):
                     file_hash.update(chunk)