Update app.py

app.py

@@ -335,6 +335,7 @@ def merge_trans():
     previous_post_rec = mychain_rec.print_previous_block()
     
     send_block = {
+            'block': blockchain.print_previous_block,
             'role': 'Sender',
             'name': previous_post_send['transactions'][0]['sender'],
             'index': previous_post_send['index'],
@@ -345,6 +346,7 @@ def merge_trans():
             'proof': previous_post_send['proof'],
             'previous_hash': previous_post_send['previous_hash']}
     rec_block = {
+            'block': blockchain.print_previous_block,    
             'role': 'Recipient',
             'name': previous_post_rec['transactions'][0]['recipient'],
             'index': previous_post_rec['index'],