Export breaks on UUID fields

[frnhr]

• Django Export Action version: 0.1.1
• Django version: 1.11.3
• Python version: 3.5.2
• Operating System: MacOS Sierra

Description

Export a models that uses UUIDField for primary key (and probably any other retular field).

My model:

class MyModel(models.Model):
    id = models.UUIDField(
        primary_key=True, max_length=37, unique=True,
        default=uuid.uuid4, editable=False)
    ... # more stuff

What I Did

In the admin export, selected all field, including 'id'.

Error:

'ValueError' object has no attribute 'message' on last line in /python3.5/site-packages/export_action/report.py in build_sheet:

        try:
            ws.append(row)
        except ValueError as e:
            ws.append([e.message]) 

Looking at a few frames above we see more relevant information: In /python3.5/site-packages/openpyxl/worksheet/worksheet.py in append

                else:
                    cell = Cell(self, row=row_idx, col_idx=col_idx, value=content)

Value of variable content: UUID('0dfafd80-baaf-4d95-b357-4804bda3d751')

Deselecting id field in the export view removes the error (but of course, there are no IDs the export).