Don't explode if missing the README

bin/app-json.py

@@ -164,9 +164,13 @@ def get_app_metadata(app_path):
 
     chdir(app_path)
 
+    try:
         with open(f"{app_path}/README.md", "r") as handle:
             log.info(f"{app_path}/README.md")
             contents = handle.read()
+    except Exception:
+        log.info(f"No {app_path}/README.md discovered, moving on")
+        return {}
 
     try:
         for match in findall(r"\*\*.*\s\*", contents):