Update app.py

app.py

@@ -423,10 +423,12 @@ def issue_tokens(send,rec,amount):
             try:
                 r = requests.get(f'{main_balance}{rec}.json') 
                 lod = json.loads(r.text)
+                balance = lod[-1]["balance"]
+
             except:
                 lod=[]
+                balance=0
                 pass
-            balance = lod[-1]["balance"]
             print (balance)
             balance =int(balance)+int(amount)                
             block = {'index': len(lod) + 1,