test: wallet_bumpfee assertion fixup

Author: jonatack

test/functional/wallet_bumpfee.py

@@ -258,8 +258,7 @@ def test_dust_to_fee(self, rbf_node, dest_address):
     # in the witness is divided by 4 for the vsize, so this variance can take the weight across a 4-byte
     # boundary. Thus expected transaction size (p2wpkh, 1 input, 2 outputs) is 140-141 vbytes, usually 141.
     if not 140 <= fulltx["vsize"] <= 141:
-        print("Error: Invalid tx vsize of {} (140-141 expected), full tx: {}".format(fulltx["vsize"], fulltx))
-        raise AssertionError
+        raise AssertionError("Invalid tx vsize of {} (140-141 expected), full tx: {}".format(fulltx["vsize"], fulltx))
     # Bump with fee_rate of 0.00350250 BTC per 1000 vbytes to create dust.
     # Expected fee is 141 vbytes * fee_rate 0.00350250 BTC / 1000 vbytes = 0.00049385 BTC.
     # or occasionally 140 vbytes * fee_rate 0.00350250 BTC / 1000 vbytes = 0.00049035 BTC.