Update app.py

app.py

@@ -376,8 +376,7 @@ def issue_tokens(send,rec,amount):
     trans_mes=None
     balance_send = 0
     balance_rec = 0
-    mes = None
-    
+    mes=""
     try:
         _,z=valid()
         if z == True:
@@ -420,7 +419,7 @@ def issue_tokens(send,rec,amount):
                     if balance_send < 0:
                         mes ="Not enough tokens"
                         p = False
-            if val == False:
+            else:
                 p = False
                 mes=mes1
                 pass