Fix issue with get_constraints (#1549)

mythril/support/model.py

@@ -32,6 +32,7 @@ def get_model(constraints, minimize=(), maximize=(), enforce_execution_time=True
     for constraint in constraints:
         if type(constraint) == bool and not constraint:
             raise UnsatError
+    if type(constraints) != tuple:
         constraints = constraints.get_all_constraints()
     constraints = [constraint for constraint in constraints if type(constraint) != bool]