Add support to default empty list

mythril/interfaces/cli.py

@@ -328,8 +328,9 @@ def validate_args(parser: argparse.ArgumentParser, args: argparse.Namespace):
             exit_with_error(
                 args.outform,
                 "The transaction sequence is in incorrect format, It should be "
-                "[list if possible function hashes in 1st transaction, "
+                "[list of possible function hashes in 1st transaction, "
-                "list of possible func hashes in 2nd tx, ..]",
+                "list of possible func hashes in 2nd tx, ..]"
+                "If any list is empty then all possible functions are considered for that transaction",
             )
         if len(args.transaction_sequences) != args.transaction_count:
             args.transaction_count = len(args.transaction_sequences)

mythril/laser/ethereum/transaction/symbolic.py

@@ -20,13 +20,17 @@ CREATOR_ADDRESS = 0xAFFEAFFEAFFEAFFEAFFEAFFEAFFEAFFEAFFEAFFE
 ATTACKER_ADDRESS = 0xDEADBEEFDEADBEEFDEADBEEFDEADBEEFDEADBEEF
 
 
-def generate_function_constraints(calldata: SymbolicCalldata, func_hashes: List[List[int]]) -> List[Bool]:
+def generate_function_constraints(
+    calldata: SymbolicCalldata, func_hashes: List[List[int]]
+) -> List[Bool]:
     """
     This will generate constraints for fixing the function call part of calldata
     :param calldata: Calldata
     :param func_hashes: The list of function hashes allowed for this transaction
     :return: Constraints List
     """
+    if len(func_hashes) == 0:
+        return []
     constraints = []
     for i in range(4):
         constraint = Bool(False)