Merge branch 'fix_reset_visitor'

Author: shtaxxx

veriloggen/seq/reset_visitor.py

@@ -62,6 +62,8 @@ def visit_Cat(self, node):
         for v in node.vars:
             val = self.visit(v)
             width = v.bit_length()
+            if width is None:
+                width = 1
             if val is None:
                 right = vtypes.IntX(width)
             elif isinstance(val.right, int):