purge project when meta.json is corrupted

jass/__main__.py

@@ -5,7 +5,7 @@ import os
 import sys
 import argparse
 from datetime import timedelta, datetime
-from json import JSONDecoder
+from json import JSONDecodeError
 
 import uvicorn
 
@@ -177,7 +177,7 @@ def w_clean_project_data(args):
                     print("removing its large files")
                 else:
                     print("large files already removed")
-            except JSONDecoder as e:
+            except JSONDecodeError as e:
                 print("removing as meta.json is corrupted (" + str(e) + ")")
         else:
             print("keeping it")